Aha--if there could be sound, there would have been a laugh, a short 'snort' of amusement. The motion to make the sound was there, but even his breath makes no noise, so the fact that there isn't anything else is quite natural, really.

As it is, Kaito shakes his head, taking both his hands into a gesture of someone falling a fair distance. These are long-fall boots after all--they're meant for falling, nothing else.