Alas, there's no heartbeat to hear. But that question is so nice! They pat his chest again, just the once, before pulling their hand back and nodding very rapidly. Yes! Yes, they're okay, and it was fantastic-- things are wonderful, and they realized belatedly perhaps they owe him an explanation.

There's a lot of high-pitched chatter, meaningless noises as they go to their desk and write out an explanation:

posterman miss, right next to a little drawing of what might just be a book.