Nick's smile opens to the point that he flashes teeth, if only for a second--it's his way of laughing, more or less. He doesn't know why it strikes him funny like that, but it does. Maybe it's just how human it is, this awkward comforting. The way this kid is ready to help him, even though he doesn't know Nick from Adam.

It makes him smile because maybe this won't be so bad, after all.

Just keep being. He slides that note to Isaac in the hope he'll keep it. Or can you bake?