I don't want to sound like I'm stealing Goatfury's thunder -- I don't mean to and I hope I'm not because I've learned a lot from him -- but if people think this would really enhance their game I suggest they look into Eduard Telles' DVD series. He uses this movement (slightly different, but essentially the same) EVERYWHERE -- as an escape from side control, as guard retention, as a standing takedown -- and I can say that I broke through a longstanding plateau by practising Telles' stuff. Telles was so out of the box he actually turned bottom turtle into a guard. Combine that with Sakuraba's bottom turtle aggression and you'll be begging people to take your back.