I said this when the rule changes were made, but some of these blocks in the video NEED to be legal to protect the QB. If an OL can't block a defensive lineman who has passed the QB and is now coming at him from his back (blindside) then something is wrong with the rule. Also, blocking a guy within 5 yards of the ball carrier seems different than doing it 15 yards away from the play like Benjamin did. My biggest issue with the Knox block is that the runner was down so the block was unnecessary, but if he was on his feet then the DB can totally make the tackle. However that has no impact on the rule, which is silly.