And yet this is the kind of hit they flag all the time. Obviously it's something they're calling. So while you may not be able to find something that word for word fits this situation, this is something you'll see flagged in college games. I know it's fun to use the rulebook to prop up your position, but it's just a joke in this case. Pathetic.
I literally LOLed at this. Your position would be like griping that a player was flagged for throwing a forward pass when he was beyond the line of scrimmage, and when someone points out to you that this is the rule, you say, "Yeah, but people throw forward passes all the time, and they aren't flagged."
You cannot make up rules for the game to suit your argument. The rules are the rules, and they are being applied properly in this situation. The fact that Martin not only was not thrown out of the game for a flagrant foul, but WAS NOT EVEN FLAGGED, should speak volumes in this instance.