Byleth does seem fine in fact. Excited to try again, which he immediately does. Again and again. He does try going faster, and with each inevitable wipeout, sends himself skipping like a rock across the water. Delighted with it nonetheless.

Eventually though, he is shivering from being in the water too long. Enough that it finds him curled up against Dimitri to steal some body heat. Seems it's probably time to get out.