"Barry, on your left!"

An arrow whistled past his left ear, hitting it's target behind him in the shoulder. The man screamed and fell to his knees, clutching his wound.

"Thanks." Barry yelled, before running to the other side of the room, followed by a short trail of yellow lightning.

Another yelp, and two more men fell to the ground. One held his thigh, the other cradled his foot.

Wind whipped around the empty shelter and within seconds, all the men were unconscious and tied to the far wall by metal chains.

Barry Allen brushed his hands together and turned to his 'partner' beside him.

"What?" Oliver Queen's gravelly voice snapped.

"Nothing, just ..."

"Just?"

"Waiting for a thank you."

Oliver rolled his eyes and crossed his arms, facing the young speedster with a plain expression.

"Thank you."

Barry chuckled and removed his mask, followed by Oliver lowering his hood. Both stood and waited until the approaching sound of sirens broke through the night air.

"Meet you at S.T.A.R Labs." Barry said quickly, before sprinting out of the empty shaft.

"Yeah ... Meet you there." Mumbled Oliver. Turning and giving the bundle of unconscious men a last glare, he strolled to his motorcycle and made for the centre of central city.

XXXX

15 minutes later, Oliver entered the cortex at S.T.A.R Labs. Caitlin was crouching down in her pencil skirt, swiveling left and right to pick up pieces of paper that had been blown to the floor - no doubt by Barry's hasty arrival. Cisco sat at the desk, talking to Diggle about certain Meta-Human powers.

Glancing around once more, he noticed two of their company were missing.

"Where are Felicity and Barry?" He asked to no one in particular.

"Treadmill." Replied Caitlin, before placing the stack of paper she had collected firmly on the desk.

Oliver changed from his uniform into a simple shirt and jeans before heading down to the treadmill. His limbs ached from the fatigue after the fight, but he felt wide awake, especially in these surroundings. It was 11pm and the bright white lights of the building imitated natural sunlight almost perfectly, coupled with the always enthusiastic team Flash. Everyone, in both of their teams, were more relaxed with the every-day fighting crime business they seemed to be running. Caitlin and Cisco had begun to take their responsibility more seriously, Diggle, Felicity and Oliver were closer now than before and Barry had improved on his speed and physical combat skills - thanks to Oliver's insistent training program. They were working closely as a unit, and mistakes were rarely, if ever, made anymore. They had become almost unbeatable.

Almost ...

A/N:
Bit of a slow start, I know, but I promise you, things'll definitely pick up soon, don't you worry. I love The Flash and Arrow crossovers, especially the friendship they all have so I thought I'd do a little fic on that being tested. A nasty meta-human to come, some humour and a little bit of whump here and there. As always, I start my stories short and build up the amount I put into my chapters. They will get longer and more exciting as the story progresses. Anyhoo, second story, here we come! Please follow, favourite and review - although not much to review so far is there. If I'm on a roll, chapter 2 should be up before tomorrow. :) Cheers guys - Ellie x