His eyes followed both Sams as they left the room, keeping one ear out in case something went wrong. His instincts in a fucked up situation like this told him he should keep his little brother in his sights at all times but he knew that would just make Sam pissy.
Dean frowned hearing the soldier-looking guy's words and slowly made his way over to him and the one who may or may not be named George. So far he knew both Sams, Rose, and he'd heard the trench coat dude being called Doctor...so these two were John and Neal though he didn't know which was which. All he knew is one of them was lying.
He gave the "George" guy a pleasant smile...he'd try to give the guy a chance before he started to get pissed. "Any chance one of the names up there is a nickname or alias of yours? Cause see, if you're not up there it tells me two things...that you may be partially responsible for what's happening and that there's somebody who should be here that isn't. That means we'd have to go do the search party thing, which sucks and takes up a shit ton of time we could be using on figuring out how to get out of here. So...you sure you don't recognize any of the names up there Georgie?"