He doesn't expect the sudden jolt forward and he's left scrambling for a tighter grip on the boy. And maybe, not exactly getting it either. He slides back on the dragon, arms going to grapple. He only just hears Yuya crying out in protests and then they're skidding to a halt-- loosening the last of his grip and sending him tumbling down the dragons back. He manages to just barely grasp the dragons tail, keeping him from entirely falling off.

He catches his breath, then slowly climbs back up. "...Are you sure this is safe?"