Is anybody else familiar with the method of pinching your knees together as you pop your hips up while someone is in your guard? If you hit it right on their bottom rib it hurts like a bitch. And if you can underhook your own legs behind his back you can do the same thing, but it's a lot tighter.
If I was in a bjj tournament I wouldn't do this, but I would in an MMA fight.
"The battle is won or lost far away from witnesses--behind the lines, in the gym, and out there on the road, long before I dance under those lights."