It's all fun and games until someone mashes their rear brake, I think he got spooked by the larger diameter rocks, sat down and gave it way too much rear brake in those conditions, probably afraid he would wash out the front tire that was bouncing around. Rookie mistake I've made as well.
Wayyyyyy to sensative and he should take up a different hobby, especially when I saw his mangina in those xrays. Laying there maybe to catch your breath or do a once over to see if anythings twisted the wrong way or protruding bones I can understand but he was clearly milking it, If I pulled that with my riding buddies, they would start digging a hole after 10 and continued on.......just saying.
Glad to see he walked away from it.