He throws away his reins and rides through it like a boss.
Everyone who jumps knows that, no matter WHAT we think we are doing up there, it's the horse who is jumping the fences, and if something goes wrong, it's the horse who is going to take care of it.
Remembering that when 5' 6" fences are rushing up on you is another thing entirely.
When I watch this I am amazed at how instantaneously and effortlessly he just lets go and stays out of the horse's way...and I say that as a rider who used to be teased mercilessly because I was always coming at the biggest combination on the course having dropped either my reins or my stirrups.
But I never did it on purpose.