You don't think someone can just make a mistake?
One of the draw backs of learning riding is you have to ride to learn. It isn't something you are going to learn by reading about it, or watching, you just have to do it. It requires alot of quick moves that you can only gain thru alot of experience. His fall was more then likely just an unforturnate result of maybe inexperience. That doesn't mean he was a bad rider or wasn't trained properly. IMO:)
Becky
If you are learning you should not be jumping. Yes, people make mistakes but handling a situation on a horse should be automatic before you take on anything such a jumping. An inexperienced rider is a bad rider. If they were experienced they would probably be a good rider. You can argue whatever you wish the fact of the matter is he didn't do what he should have known to you and he broke his neck. He was ahead of his experience and ability and paid a huge price.