"It's possible that since your world's magic isn't active here, it's drawing from the only source of it that the bike can find: you."

So yeah, that's not good.

"I could allow a couch for a bit," he said, looking a bit torn. "I was going to go around and see if anyone was hurt and what I could do to patch them up. But if you want me to stay with you, I will."

Doctor David is bubbling up and he can resist it, but that doesn't mean he does it well.