All,
I was with you folks when I saw the play; no way that was helmet to helmet...
But after reading Craic's initial post, I have to side with him.
He's right, during a sack, you cannot drive the QB to the ground like that. It's gonna draw a flag every time.
I'm not going to say that it's a penalty according to the rules (I don't know) and I'm definitely not saying that it *should* be a penalty (it shouldn't)... but if you hit a QB that hard in today's league (regardless of what the rules say) you're going to draw laundry. And once the flag is thrown, you can't challenge it.
Better to not drive the QB to the ground like that. It may or may not be technically illegal, but as a practical matter it might as well be.
Best,
-Slashy