Clint had heard the story, about Steve rescuing the POW's, Bucky included, but never the details. He had to assume that's what this was though, somehow. The only thing he didn't know was whether this was a new arrival or one of their own thrown back. Either way, they'd have no idea who he was.
"My name's Clint. Barton." he told him, leaning over the table to undo his other wrist. "I'm...a friend of Steve's."