Bruce was multitasking typing and pausing now and again to write on a legal pad, filling it with equations and notations of his own to reorganize Howard Stark's ideas to fit his own frame of reference.
It was only when Tony asked a question that he realized he'd forgotten he was still there. The question was something he had been asked before by Betty but it still made him uncomfortable to answer it. "...doesn't hurt," he mumbles in reply, shifting a bit in his chair without looking up from the screen. "Not that I remember anyway." Afterwards, of course, he's achy and sore all over but that passes eventually. Tony might have to prod him for more information beyond that, Bruce tends to be very reserved about sharing anything about himself. Even with teammates.