Ever since meeting Steve Rogers, the weird was pretty much a constant in Sam's life so he nodded at Pepper's explanation even though the idea of multiple realities was a little over his head.
"Banner mentioned him," he said. "We didn't get much of a chance to talk though. Too busy fighting off Thanos's lackeys." Not that they'd been successful. "So, uh, Tony's around, I'm guessing?" It was an educated guess, given that they were in Stark tower and Pepper looked like she was ready to pop. "Who else?"