Sitting still just isn't Papyrus' thing, not without something of interest to pay attention to. So walking around the ship, cramped as it is, is the only thing for him.

Many of the faces here are still unfamiliar, since most rescuers have been working solo or in small groups... But then he finds a surprise. That human, and the voice he's muttering in... It takes him a minute to place him, but memory kicks in.

"Oh! It's you again!" He doesn't bother to introduce himself, and he waves with the self-assurance that he doesn't need to. "I didn't know you were one of us!"