The whole reason behind the rule is for player protection, specifically to protect/prevent(which is impossible) concussions. Wellllllllll that player was obviously concussed by the hit he took from the opposing players. Therefore it's a dang penalty. He wasn't concussed because he was tackled and his head hit the stupid fake turf, or because he caught an errant knee while being tackled. It's just a botched call by an SEC official (replay this time which should never happen) so I shouldn't be shocked. They all suck.
yes, that's the intent, but the rule is written with a 'defenseless player' in mind. On this play, Prentice didn't meet that definition per the rule. Maybe the rule should be edited, but as it is now, he was not defenseless.