They said it was unusual for a boy to do.
Now, when Jet and the neighbor kids ride bikes together, they all crash periodically. They now ALL get off their bikes, go to the crashee and help them up, pick up the bike, and comfort them until they get back on the bike. They do this even when they're a fair distance from each other.
I talked with Jet later and he just said he likes doing it, and that he was sorry when he hadn't seen M. fall. So that was cool.