So my guess is either a winddraft pushed him back and/or he didn't jump out far enough? I've never skydived before, but that's what it looks like to me. I'm also guessing that he was knocked unconscious out at some point or accepted that he was going to die? Because after hitting that rock and pushing off, he seemed to stop fighting it, hands were just floating along.

All I can say is, play stupid games, win stupid prizes.