Rory had a problem with his North South Choke in that, he was rolled over after his sparring partner cupped his chin. Marcelo's solution is for Rory to hide his face and keep his shoulders aligned parallel with the surface of the mat. Rory also encountered trouble clasping his grip for the choke. One possible resolution to this is to lock the opponent's arm inside, and squeezing your ribs into the side of his neck, rather than his own shoulder. Whatever you do, don't lose the position; the North South Choke should be considered with as much urgency as almost sinking a Rear Naked Choke -- you have to finish.