Both fighters are trained to deliver shots like that and they're also trained to defend against them. This video is the result of a well executed round house kick and a **** line of defense. Homeboy just watched a foot come at him at 90 mph and land on the side of his head. He's supposed to block or duck (and hopefully scream out "WA-PAA!") but he did neither and went to sleep for his trouble. If I were Dana White, I would have fired him before he came to.
In the NHL, it seems that the majority of the concussions occur through an illegal hit combined with a player who doesn't see it coming or is looking elsewhere.
What they need to do is STOP using the word "concussion" and start using the term "brain injury". Concussion doesn't mean the same thing to many people. Everyone understands "Brain Injury".
