I hate these "shocking" video clips" that float around the internet becuase they have no context, i.e. there is no information connected to them so that you can hear the whole story and find out the cause/result of the event.
It was kind of funny (not funny ha ha but odd funny) how the first rider crawled off the track as if injured (the bike DID roll over him, to be sure) but then came scampering out after the two track crew got fragged. that crew guy in the middle and the second rider really looked F'd up - they were either knocked out cold, paralyzed or dead. 😱 🙁
That second rider was behind a couple of bikes and probably didn't even see it coming. They should have had a flag slowing everyone down, those guys were going way too fast with an accident on the track.
Oh, and I'd like to give a shout out to Mr. Delerium Tremens cameraman - could you shake that camera a little more? I'm not quite dizzy yet. 🙄