Even if he's offered the chair, Sam remains standing, mostly since he doesn't think he can sit still with the current situation - being closed in a smallish room while still not knowing what is going on. He's already been threatened and shot at in the open, so this isn't exactly helping his nerves, especially since Bruce seems a lot different then himself five years ago - and he's not just implying the arm.

"I'm good," he says, holding a hand up in an indication of 'no' to go along with his words. "Why am I here?" Might as well get to the point.