i guess they didnt really know he was dead just maybe thought he passed out
No one knew how serious it was.
I know, but in a combat sport/entertainment, the health of the people must be #1. MMA Refs are told to stop despite the fight to protect. When a guy is not moving, or his head down, one has to assume a concussion or knocked out. You can see in the video, they tried to wake him up. Immediately they should have quickly seen if he is suffering a medical emergency.