The regular RNC choke is performed with one arm across the throat and grabbing the bicep of the other arm who grabs the opponents forehead. Why isn't the "forehead arm" who is grabbed by the "choke arm" put on the back of the opponents head? If the forehead arm is removed by the opponent, the choke loses most of its leverage. By putting the forehead arm behind the head it's harder to get out of the RNC. Also, You can generate way more force and leverage that way I think. Why isn't a RNC performed like that in mma?