Since this was brought back up, here are some facebook posts about it,

From Jeff, the guy that I made initial contact with: "I still don't blame anyone. crashes happen..."

From Dan, the guy who went down hard and went to the hospital: "Many thanks for posting the video. Looked at it frame by frame and confirms what I remember. Important considering I don't remember anything post-crash. I'm dumbfounded by the comments posted. Don't pay the antagonist haters any mind. The cause was and is pretty obvious. Hope you are feeling okay..."