Of course there is a subjective scale. It was a very light hit, the softest one I have ever seen that resulted in a concussion. You could tell Jay gave up in the first half. This was his way out of the game. He is making a statement to Lovie and Jerry. I'm confused as to how having the back of your head smack against the turf is soft. Because it wasn't slammed that hard against the turf. This sort of stuff happens on every play.