Okay. Never heard the term before but I'm familiar with the concept. It is very effective against right hands of any and every sort, and the right hand should thus be freed up to block the left hook with the glove,and the hook to the body with the right forearm/elbow. And, of course, the left arm if the dfender is willing to leave himself with no hand to counter with. That used to be much more a universal defense than it is now. I never could figure out how in the world it became unfashionable to teach rolling with punches and using the shoulders.