That's awesome, dusted. Reminds me of a pitch Sparky Lyle used to throw at all the Yankees Old Timers Games. Lyle (a lefty) used to go through the regular motion but hold the ball through the normal release point all the way until his arm crossed his body on the follow through. Then he would release the ball from under his right arm so that the ball would sail over his head to the catcher. He was able to throw that pitch with amazing accuracy. It was right up there in entertainment value with Ryne Duren's warm-up pitch straight into the backstop, which was also an Old Timers staple.
I am not to sure about this as a sport, but it is definately impressive. There is no way I am getting on a horse at all, much less while it is doing that!