Peter kind of stands there, staring at the guy with the seriously white hair, awaiting an answer.

And growing more and more awkward with each passing moment.

Maybe he can't hear? It hasn't occurred to him the guy could be deaf.

Okay.

"Uh - hey." Peter starts to wave his hands about, first as a means of getting Jack's attention, and then secondly in a greeting motion. "Hi. Can you hear me?"