"Of course I did."

Bruce looks away from his hands, folding them carefully across his chest to glance at Bucky. "Was there a doubt I would?"

It's a rhetorical question. Clearly, there had been, and he doesn't blame Bucky for that. It doesn't take a doctor to notice that the man doesn't seem to trust people, and Bruce is hardly in any position to judge him for that. Bruce himself is still hesitant to trust anyone, even his own teammates.

"Maybe we should try avoiding the escalators from now on."