It was just an accident. There were other Heroes who could be fairly dangerous on Chocobo back but Cloud was a bit better than that. And as overeager as Zack could be he was a bird who behaved himself.

"Ah. So you're from one of those worlds that has those...horse things, right?" He didn't disbelieve the other Heroes. Enough from different worlds were agreeing on the point. He just honestly couldn't picture it.