Leon watched as Derek Simmons fell onto the top of a bullet train in an attempt to escape. Leon ran as fast as he could, reaching the edge of the platform and launching himself onto the final car of the train. He opened the door and ran through the train quickly before lifting himself up through a compartment in the roof. He approached Simmons and stopped, drawing his pistol and aiming at him.

"Give it up, Simmons. I've got you."

Simmons turned slowly to face Leon, his teeth grit. He tried to distract Leon by mentioning Ada, but the agent kept his sights on Simmons.

"Another team was sent after her, but you Simmons, you're all mine."

Simmons suddenly clutched at his neck, letting out a sharp cry of pain. Leon's eyes widened as he realized far too late; Derek Simmons had been infected with the C-Virus. Simmons fell to his hands and knees and his metamorphosis began, Leon watching on in horror as the man before him began to mutate. His skin looked like it had been carved open with a serrated knife, the pattern running jaggedly over his body. He let out a scream that turned inhuman as his body grew and molded into the shape of a large tiger with four very long, deadly teeth protruding from its mouth. Leon fired a few shots but none made contact, the creature jumping over him with ease. It dug its long claws into the metal of the train, easily tearing it open.

Leon turned on his heel and fled, running towards the back of the train in an attempt to put some distance between him and Simmons. He dropped inside the manhole, staggering as the train was torn open and Simmons climbed inside. Leon drew both of his pistols and began firing, aiming for Simmons head. He roared and swung out with his claws, Leon stepping back and narrowly avoiding being eviscerated, the tips catching the fabric of his dress shirt and tearing the top three buttons off.

Leon ran, attempting once more to distance himself from the ravenous beast. He aimed and fired the rest of his pistol ammo, the beast hissing and mutating back into human Simmons. Leon ran and punched the man with an uppercut, taking Simmons to the floor and straddling him as he wailed on him with both fists. Simmons growled and his skin began to shift, Leon quickly getting up and stepping back before the man changed again.

Leon lifted himself back onto the roof of the train. They had entered a tunnel, a second train running alongside them. Simmons jumped up, snarling, saliva pouring from his jowls. Leon drew his magnum and shot the creature in the head repeatedly. He changed back to his human form and fell onto his back, unmoving. Leon approached, lowering his weapon. Simmons rose to his feet quickly, grabbing Leon by the jaw and throwing him roughly. He landed on the platform of the second train, rolling onto his stomach dangerously close to the edge.

Simmons mutated again, this time into a bigger version of the creature with a large appendage protruding from his back. Leon turned and ran, the appendage firing small bolts of bone at him. He raised himself to the roof of the train and jumped across, the beast's rain of bolts narrowly missing him as he landed back on the first train and rolled. Simmons jumped behind him, the weight causing the metal to collapse and making Leon fall through the floor. He landed hard on his back, winded momentarily. He noticed Simmons now running beside the train, keeping the speed easily. The appendage on his back began shooting more bolts and Leon quickly ran, the thin metal easily torn through behind him.

"Our fun has come to an end!" Simmons yelled in an inhuman voice that sent shivers down the agent's spine. Simmons jumped, tearing his way through the inside of the train towards Leon, who lifted himself back onto the roof. Simmons launched himself back out of the train and ran ahead, turning and running straight for it.

"Leeeeeon!" He screamed in his thick, primal voice.

"Simmons!" Leon raised his magnum, firing at the monster as it approached. His eyes widened as several of the bolts were launched at him. He had nowhere to hide and couldn't react fast enough; three of the bolts pierced into his skin, two in his stomach and one in his shoulder. He staggered and Simmons jumped, mutating back into a man mid-air, the jagged pattern on his body dripping blood. He grabbed Leon by the neck, lifting him into the air. Leon gasped and made an attempt to raise the hand holding the magnum. Simmons caught it and wrenched it painfully, making Leon cry out and drop the weapon, which fell to the tracks below.

"Your time is up Leon!" Simmons laughed as he slammed the agent onto the metal of the train's roof, repeating the action several times before Leon went limp in his hold. As Simmons brought his hand back to deal the killing blow, something stopped him. A small, frivolous voice in the back of his head.

Wouldn't it be more fun to make him suffer?

Derek lowered his hand and smirked. Oh, he would make Leon suffer. For the rest of his life.