A moment later; the heavy metal lock on the single door into the room (and the only entrance/exit) creaked open; in strode a tall, heavily built man. He had dark hair and a scarred face. Grey eyes starred at each of his captives, his thin lips turned up slightly at the sight of them.
He slowly strolled to the centre of the room, pushed his way between Clint and Thor and faced Steve from the middle of the circle;
"Welcome. I apologise now for this will not be a pleasant experience for you"
"What do you-"
Before Steve could even finish his sentence, the man withdrew a gun and fired one shot through Clint's thigh.
Natasha's eyes went wide at the abruptness of it. Thor struggled against his binds and Tony yelled in outrage. Clint's leg gave out from under him and he struggled to remain balanced on just one.
"Russian Roulette anyone?" the man smirked around at them, waving the gun around like a toy. "But how rude of me; I of course know who you all are, but you don't know me now do you?"
"No offence but I don't really want to" Tony said without thinking; the man turned slowly and smirked at him. "Mr. Stark; my name is Gavrok, and you need to learn some manners" and with that, he lifted the gun and shot Steve in the calf.
"WHAT THE HELL-"
"Do you wish me to continue?" Gavrok asked, lifting the gun and aiming it squarely at Natasha's face. She didn't finch once, the rest of the team however, did. Tony shook his head, glancing apologetically at both Natasha and Steve.
The team now silent, Gavrok jabbed a needle into both Clint's and Steve's necks, knocking them unconscious almost immediately, he released the cuffs which bound them and called in some men to remove them from the room.
Smiling at the remaining four he flipped off the light and slammed the door shut.