Oh, so Iron Man and Cap are fighting besides the chamber that's holding Bucky? Ok. So that must be Buck in the chamber there, right? Except, well, in this shot you can just about make out another figure behind Iron Man, which looks a hell of a lot like Bucky. So if he's outside the chamber, then who the heck is inside of it? Could this be the as-yet-unseen Baron Zemo (played by Daniel Brühl)? Theories suggest he'll have a big part to play, manipulating things from the background, and also in the capture and torture (or whatever it is happening) of Bucky, so it could make some sense if it's him, though quite why he'd be in the chamber is unclear.