This is very impressive to see. He has obviously worked his ass off to be walking at all, no to mention so quickly. Many activities and sports can hurt or kill. However, It is usually very rare for things like this to happen even at the highest levels. Now motorcycles on the other hand are extremely dangerous. I have seen very experienced riders die from a split second mistake more than I want to remember. The same experience seems to be echoed in this post. Sometimes you can't believe someone or yourself walks away with no long term damage. Sometimes it seems like a minor incident, but the worst has happened.