As a trained first responder what I loved about it was the inital first-aid the (poor) guy got. That one where someone comes over and straightens out his legs on the mat. Really rilly smart move there guy. With that potential of a serious back injury like that one you don't move the guy until professionally trained EMT's are there. And yet they show him being carted off on some sort of board... no neck-brace ... Ya, now the time is to wonder the aftermath... he probably was okay from the fight itself more than the first-aid he got. Jeez.
But the move itself ... don't know much about BJJ but I presume that is illegal? But it did happen so fast that the ref didn't have time to stop it.
The guy doing it... to me it seems that he should've known what that would've done and what it did considering how fast he got off his opponent.
On the streets that'd been a great move but in a tourney?
Ya, I feel for the guy. I have an auto-related back injury and know about the pain a hurt like that can give.