A guy in on his back, up kicking at his opponent. But he has no defense to what comes next. The guy jumps over his legs and stomps right on him, then follows up with some ground n' pound.
My instructor has always tried cartwheels to try and get a better position on someone on the ground from a standing position, and while it's counterable by using your legs... as long as they don't see it coming you get an excellent position from it.