There is a vid from a different angle that you can watch afterwards that shows that the poor lad that caused the accident had his legs run over (that caused the big flip furthest from camera) and then another rider hits his helmet/head at full whack and causes the other flip closer to the camera. He didn't get up.
That was horrible. I hope they were ok.
Can you tell, I ve just started riding again?? I'm terrified by everything