"Howie doin'?" asks the skeleton, who goes on, "I'd say better than that time you almost fell into a black hole."

By all appearances, he seems content to laze about, do nothing useful, and ask after a strange kid's wellbeing -- all as if nothing unusual had taken place. Unusual stuff like kids he doesn't know somehow being unsurprised by powers he tends to use sparingly, or who know just the one guy on the whole island Sans would trust. Y'know, stuff like that.

Except he does remember, and he doesn't really intend on letting them off the hook. Hell, he could even segue to that right now, but... eh, what's the hurry?