[cowbyfan1]

What is being discussed is a defender putting his hands flat on the back/sides of an offensive linemans helmet and controlling the player that way. If I see it I tell the defnders to get off the players helmet. Usually cleans it up.
I do have a hard time calling a penalty on this though. What real difference is there in a defender doing that to control an o-lineman and a running back stiff arming a defender to the helmet/fasemask? Both are flat handed against the helmet and both are using the opposing players head to gain control of the player.