Thanks for the explanation of the leverage guard. I've seen it before, but how I've seen it was with a raised elbow and the left forearm was perpendicular to the floor (almost like a left hook). I imagine this way is better? It's almost like you are firing a jab to their shoulder.

But I guess with this move, your feet position is critical. Your left arm would have to be inside his right. Or better explained by having your left foot inside of the opponent's lead foot.