I play the lockdown a lot at my gym, and I am considered the 10th planet guy. The guy in the video teaching the move was one of the 10th planet guys in my gym before I got there. I know both the guys personally in the video, I train regularly with the guy on top who has been a blue belt for well over a year now, while the guy on the bottom doesn't train anymore. Our coach, a Black Belt under Kurt Pelligrino, says he has seen him hit this move live many times. I don't use it however, so I can't comment on its effectiveness.