Disclaimer: I don't own Harry Potter or Left 4 Dead (Even though it is a wicked game). I just wish I did.

Harry Potter/ Left4Dead crossover

In Case Of Zombies

By: Mage-Alia

Chapter 2: Two Weeks Later

Summary: What do you do when the world is being consumed by a mutated killer virus. What happens when your relatives, in one last reluctant act take you with them to another country, and what happens when they leave you for dead against the Undead hordes? Harry is put to the test as one of the few survivors of the Apocalypse, but with no help from the wizarding world, how long will he last?

AU, No Pairings.

Alley Off Main Street – Downtown Fairfield.

T Plus 2 Weeks

It was a rather tired and bedraggled bunch that made their way down the alley between two apartment buildings in downtown Fairfield.

It had been two weeks since that eventful first day when Zombies had overridden the city, causing mass chaos and panic. To Harry, those two weeks felt like an eternity as survival became the biggest focus of all. Where he'd once believed that he was only just Surviving, after Voldemort killed his parents he knew now, without a shadow of a doubt that he couldn't have been more wrong if he'd tried.

In the past two weeks he'd killed zombie after zombie in what seemed like an endless horde as he and his companions tried to mow their way across the city, but the task itself was hard. They had to compete with the mutants now as well.

Not long ago, a few of the zombies had started to mutate. Some gained a level of sentience, developing abilities that could have devastating effects on their small group if they where caught unaware.

First, and the most common of the mutations was the type they'd called the Hunter. Extremely agile and strong, they could leap over incredible distances, relying on baser instincts to direct them to the untainted human's on which they fed. Pouncing on their prey, they would pin you to the ground and claw at your guts until there was nothing left but a steaming pile of organs. It was far from a pleasant way to go.

The second most common mutation was the Smoker. These zombies grew incredibly long tongues that could lash out with an almost unerring accuracy and wrap around you before they reeled you in and slashed you to death with their claws. You could sever the tongue to make them let go but you had to kill them quick. Their limbs, tongue included, regenerated far to quickly for comfort.

The third most common mutation was the boomer. Obscenely obese, and more than a little disgusting, they could sometimes be the most dangerous to have around. Sure, they could be killed with a single well-placed shot, but that's where the problem really set in. Their bodily fluids… and more specifically, their vomit, was highly attractive to the normal Zombie hordes. When it came into contact with uninfected humans it acted like a homing device that would attract zombies from as far as a mile away until it either wore off, or was washed from the skin.

Fourth, came the Tanks. Terrifyingly huge, well and truly over muscled and far to strong for anyone's piece of mind they tore through zombie and survivor alike to devastating effect. Their small group had yet to come across one personally, having heard second hand stories from witnesses they'd found in the occasional shelter, but it was just a matter of time.

And the last mutation…?

Bill's raised hand brought them to a halt as they stopped in an alley. As enclosed as it seemed it was way too open for comfort as their fearless old leader knelt to the ground, plunging his fingers into the nearest pile of gore.

"Definitely haven't seen anything like this before." Having been a veteran of the war Bill had seen more weird shit than most, but this really took the cake as he got back to his feet.

"Don't let that stop you from smearing it all over yourself." Francis said, coming over from where he'd been following as the rear guard. Second's later he made a noise of disgust as Bill had the stones to wipe the slime all over his jacket and sneered out in reply.

"They're changing." From his place between Louis and Zoey, Harry shuddered. For the last two weeks nowhere had been safe. Francis was still cursing loudly as the teenager studied his new… for lack of a better word, Family. The four of them who'd left the shelter, and the fifth they'd picked up at the restaurant. All five of them had grown impossibly close. There had been no room for arguments or animosity when it had come to their survival. Within the first two days, Francis had been chewing at the bit, recklessly trying to take control of something till Bill had beaten it out of him. Louis had been terrified, constantly nay saying until Zoey had slapped him, and more than once they'd had to tell her to be quiet when she recited zombie lore while they where trying to get some rest in the shelters that where few and far between.

Life stories where shared, secrets busted out, they'd built a trust between them that came from saving each other's life way to many times to count and all of them where doing their damned hardest to watch over him.

For the longest time Harry hadn't dared to use magic. He'd followed along behind the others quietly, carrying a pistol and doing everything he was told. Then one night while the others where sleeping he'd tried a simple summoning charm and waited, waited for the Aurors to came and maybe even get him and the others out of this mess…. But they never came.

From that point on he'd been carefully making use of his magic to try and make the trip easier for all of them, but years of conditioning made it hard to just outright tell them as the words still rang though his mind.

'The muggles must not know.'

So he hadn't used his wand in open combat, instead, carting around a shotgun that nearly sent him flying when he fired it and a pair of pistols that gave him way more accuracy if not power. The automatic rifles Francis had somehow scrounged up more than made up for that. In the time since the beginning of the outbreak, Ammo had become one of the most precious commodities around, probably more so than food.

"Hey guys… I hear something!" Zoey suddenly hissed from her place to the side and they all froze, standing stock still as they heard crying from nearby.

Francis thought it sounded a little to familiar.

"There's someone alive in there." Zoey breathed out, looking vaguely haunted. The other three adults just looked at each other over Harry's head before the war veteran signalled for him and the other two to stay put and keep watch while he and Zoey hunted down the sound.

They tracked it to a door a little way down the alley and Harry put his back to the nearest solid wall while they waited in tense silence for them to reappear, but a few seconds was all it took for things to suddenly go to hell. Louis happened to be the one to see them first as the shadows at the end of the Alley shifted and writhed and then a horde of Zombies leapt out of the shadows with a chorus of moans, screeches and howls as they scented fresh meat.

With stealth lost Louis hid the next best thing.

"Shit, shit, shit, SHIT, SHIT!!" His hoarse cry sounded like an alarm as he swore, over and over. Francis whipped around from where he was facing the other end of the alley and neither wasted a second in opening fire and not for the first time Harry was glad he made a habit of sticking to the walls. The first line of the incoming enemies was mowed down by gunfire, but it was soon apparent that the two of them wouldn't be enough and Louis abandoned his guard post, running to the door Zoey and bill had gone through before throwing himself at the opening, torch shinning brightly into the room.

"Shit! THEY'RE COMING!" He all but yelled a split second before he noticed what exactly had been in the room with them.

When the Witch Screeched like a banshee Zoey did too.

"RUN LIKE HELL!!!"

None of them needed to be told twice.

Louis backed out the door as Zoey and Bill hurtled past him, heading over to help Francis with the horde while Louis slammed the door shut in the startled witches face.

All this had happened in less than a few seconds.

Harry nearly jumped out of his skin when the door Louis had slammed shut banged against its hinges while the Witch beat it from the other side. The black man had to leap to the side as the Witch put her claw through the door and Louis wasted no time in retaliating, putting a spray of machine gun fire through the newly made gap and not letting go of the trigger until the protruding arm went limp against the door.

"Take that you bitch!" He shot a few more rounds into the corpse even as Francis was yelling to stay together under the newest wave of zombies. Firing like crazy the adults failed to notice the smoker that had snuck up on them until a filthy green tongue shot out of nowhere, wrapping around Bill and dragging him up the nearest fire escape.

"SMOKER!" Harry shouted firing his pistol at the smoker's tongue. One bullet hit it's mark and the organ was severed, dropping Bill to the ground as Francis spun, letting out a controlled burst of gunfire that exploded the mutated zombie's head into a cloud of bitter smoke.

"Hey, guys!" Zoey pointed out the new zombies coming in from behind as Francis grabbed Bill pulling him back even as he switched guns, dropping his machine gun to its strap as he hefted his shotgun and pumped it, shooting two zombies coming in from two different directions all before Bill had finished coughing, recovering from the strangulation.

"Merry Christmas." The biker said sarcastically at having saved his life before Bill got back into the formation. The crowd had crept closer in the time it took to help him and Zoey gestured over her shoulder to Harry to pull out one of her favourite surprises.

The collage girl had developed an unhealthy fascination with things that went Boom and she grinned when he threw her a pipe bomb.

"FIRE IN THE HOLE!" She yelled, turning on the timer and hurling it away from them. Pipe bombs where brilliant for attracting and killing zombies. They beeped loudly, and the mindless hordes went right for them. Of course, when the timer finally did go off.

"Ewww…" Francis muttered under the gunfire from somewhere off to the left where he'd taken cover behind a dumpster with Bill. Louis stumbled past them, gun up ready to fire again but the Alley was clear for now.

"Shit! You like doing that too much girl!" Francis continued to grumble as he hefted himself to his feet and Zoey just sent him an unrepentant smile as the first sounds of a distant chopper started up in the distance. Louis looked up as a searchlight swept the rooftops overhead and Suddenly he was running for the end of the alley and both Harry and Zoey took off after him.

In this city, at this time… it was absolute suicide to run off alone. In pairs, your odds where slightly better, but in their group of five, they had all the bases covered. North, South, East, West and…

"UP!" Zoey shouted and Harry brought his pistol up in time to see a Hunter sail from the nearby rooftop and down into the street where it landed right on top of their friend.

"Louis!" Harry called out but the man was already pinned, the hunter's hands trying to turn him into a steaming lump of gore with broken fingernails for claws. Zoey raced across the distance, using her momentum to knock the hunter away and from where he lay on the floor Louis pulled out a pistol of his own and helped along as they all fired rapidly on the mutated zombie, knocking it back into a car and killing it. But their moment of respite was short lived as the very same car got its revenge for the crushed back end.

Its alarm Wailed into the night, echoing off the walls of the buildings, magnified in the already silent night and as Bill limped around the corner he spoke for all of them when he muttered to himself.

"This ain't gonna be good."

Shadows appeared on distant walls, and in the distance, the sound of incoming hostiles slowly grew in volume until the screams and moans of the zombies almost drowned out the blaring alarm. Zoey lead the way into the street, both her pistols out as Harry put his away, reaching for his own shotgun and brushing his hand over his wand for comfort before backing into their formation. Behind him, he could hear the ominous chime of the chain link fence that blocked the city street and didn't dare take his eyes off the shadows for fear of actually seeing the new flood of undead that where climbing over and into their section.

The others where worried, it was plain on their faces even as they stared down the record numbers of Zombies bearing down on them, but, before any of the running horde could reach them something emerged from the opposite end of the street, back lit by a fallen floodlight and Harry almost passed out with the sudden fear that nearly made him loose his grip on his gun.

"Oh, Shiiiit…"

His moan trailed off as a Car was flung through the zombies, bouncing over their heads and into the fence behind them, taking out the zombies that would have gored them from behind.

"Tank!" Zoey gasped, recognising it from the other survivor's descriptions even as Louis started backing up toward the newly made path.

"Run? Or Shoot?" He asked, repeating himself over and over until Bill finally snapped out an answer.

"BOTH!" So they ran, Harry in the lead. He guided them back into the alleys while the others shot backwards, and was first up the ladder of the fire escape when Louis pointed it out. He climbed up a fair way before he turned and started shooting, covering the others as they made the leap toward the ladder. Louis and Zoey, the much faster of the four, made it up onto the fire escape before the Tank finally turned the corner and threw a limp body at Francis.

Harry let out a scream but he needn't have worried as Bill wheeled around, returning the biker's earlier gesture as the Tank's hide was peppered with machine gun fire. Francis made the dash for the ladder but Bill was sprayed with blood as the zombie coming up behind him was suddenly beheaded by a shot.

"GET MOVING! I'LL HOLD THEM OFF!"

Harry heard Zoey shouting, but didn't turn to look as Louis pushed him up higher and Francis boosted him over the high edging and onto the apartment block rooftop. Breathing heavily he lay on the concrete, listening as the Tank roared in fury as it's prey got away, followed by the sickening sound of twisting metal as it tore up the bottom of the fire escape. Louis, Francis and finally Bill all tumbled over the brick edging before he heard a shout and the constant fire of Zoey's pistols began to falter as she screamed, and then, following a thunderous crash of the fleshy behemoth and the twisted metal of the fire escape hitting the concrete below, Zoey suddenly reappeared, pulled over the brick divider like a rag doll by Francis, the story of how close she'd come to falling written all over her face.

"We made it! I can't believe we made it!" Louis panted sitting on the ground close by, elated by their escape, and Harry sent him a wan smile before Bill killed the mood.

"Son, we just crossed the street." He pulled a cigarette out of his packet and lit up, breathing in the smoke as the sounds and smells of the lingering Horde wafted up from the streets below. "Lets not throw a party till we're out of the city." Louis's face fell and he sat quietly as the old veteran got up, moving over to a corner and sitting down where some unnamed person had tried to hole up and wait for help.

"We… we should be alright here for now." Zoey breathed out, sufficiently recovered enough to speak. Overhead, the chopper they'd seen earlier returned its loudspeaker blaring as the light washed over them.

"HEY! YOU DOWN THERE! IF YOU CAN MOVE, HEAD TO MERCY HOSPITAL! THERE'S A RADIO ON THE ROOF SO CALL US WHEN YOU GET THERE AND WE'LL FLY YOU OUT!"

It was the best news they'd heard all night.

Harry finally rolled off his back, feeling the first aid kits and their meagre food supplies flattening underneath him before he got to his feet and looked to the others. There was no hiding the hope in their eyes as they stared back and without a word they'd all silently agreed.

They where going to Mercy.

And no zombie was going to stop them.

"Hey! There's some stuff over here we could use!"

The five survivors had been lazing on the rooftop for the past fifteen minutes, recovering from their frantic dash through the alleys and across the street before they decided to explore. Louis, one of the more curious of their group, had pulled up a tarp, revealing a number of dead bodies from those that had died on the rooftop, or maybe somewhere down below and dragged themselves up there, but either way, most of them where clutching weapons. A shotgun, a few pistols, and a machine gun that had been making the rounds of the city were a few clutched in their dead grips. A few first aid kits and a bucket of assorted ammunition lay not far off as well, indicating they'd been ready to hold out for a while before things got the better of them.

Ignoring the fact that he was technically scavenging from a corpse Bill limped past and picked up the machine gun. He'd lost his after the Tank had attacked, having dropped it in order to climb the ladder to the rooftop faster. Harry had lost the shotgun, however they'd all managed to keep at least one pistol on their person, so they weren't completely defenceless.

Of all the weapons in the city, handguns had been the most common; therefore, there was a corresponding amount of Ammo for them. As long as you had a pistol, you had a weapon and in this situation it meant a great deal toward your survival.

It was even better when you had two.

Harry grabbed a second one, and stole a couple of first aid supplies before turning his eyes to the tall building in the distance. Mercy hospital was lit up like a lighthouse in the dark night. It's name in occasionally sparking letters on the side with a few search lights directed toward the sky where they'd been for the last few days. It was one of the last few places in the city that had power, having probably been running off a generator for the past few weeks.

Taking out a map of the city a pad and a few pencils he began to trace the route with one finger when Francis came and hunkered down beside him.

"Looks like a hell of a walk." He grunted, not looking all that pleased. Harry opened the notepad and on one page was a similar map. Scribbled onto the lined paper, however this one had new markings and sloppily drawn landmarks across it. Ranging from train stations and pawn brokers to the location of street blockades they'd either seen or heard about. The boy's brow furrowed as he compared the map.

"I think we'll have to take the train…" He murmured, pointing to the nearby station on the map once he'd figured out where he was. Beside him Francis cursed.

"Fuck… it'd be a death trap down there." Harry just lowered his head and looked closer.

"We need to get out of the building first." He reminded him and the burly biker groaned.

"Great! A whole fuckin' building of em." Harry just gave him a bitter grin as he began to doodle a new route on the lined paper opening up a rather torn up map of the subway to check which line went closest to their stop.

"Probably wont be any worse than taking the sewers." Francis froze, looked at him incredulously, then began to curse getting up from his crouch and stomping away to finish getting ready. Harry smirked at his exit for a little while before his face fell and he sighed, pulling out his wand to poke his first roughly drawn map.

Not long after the whole thing had begun, Harry had figured a way to help the others. Painstakingly wracking his brains for spells, he'd managed to create a very primitive version of the marauders map. It didn't move, or even detect anyone like the map of Hogwarts did, but he could update it as they moved. A few hundred meters at a time.

Anchoring down the map he held his wand in his palm above it.

"Point me, safe room." He whispered and his wand spun. It circled around a few times before it pointed off to the north east and on the map a square lit up right on the symbol of the nearest station.

Subway it was then.

His wand vanished back into his oversized shirt as he traced the glowing square and finally let it disappear. Gathering his things he put everything but the newest map back into his featherlight charmed bag and turned to the others.

"I think I figured out where the next safe place will be." He announced and they all limped, stumbled or walked over. Bill snatched the hand drawn map and looked it over before nodding.

"Looks good, with all the vandals these days all the subway control rooms are barred." He said in a gravely voice, long since over the fact that their youngest companion could mysteriously find any safe house along their route. Quite a feet if they'd bothered to care that he was an out of towner. They didn't know how long he'd been there, but hell, anything that could let them survive one more day with the hope of seeing the rest of the world one more time was too much of a blessing to look the gift horse in the mouth. The map was passed round and the directions memorised before the howl of a hunter in the distance reminded them that the world wasn't safe tonight. With each survivor making peace in their own ways, they moved to the roof access door of the apartment building and flanked it on each side. There was a long moment of quiet and with one last sigh Zoey reached out and flung the door open.

The first shot fired like a starter pistol and they where off, each of the five survivors moving together as they raced down the stairs to meet the first zombies of the newest horde. Every minute was vital and every shot would count.

Their survival called for nothing less.

A/N: And I'm leaving it there! Anyone who's played left for dead should recognise most of what happened in this chapter… after all, it's pretty much the only scripted part. Everything else I write is gonna have the major influence of my playing… habits.

Of course, that won't be including my teamkill score… : )

Don't forget to review!

Cya