One of my students did that move in class and I thought that the other guy was gonna die. No joke. The other guy collapsed and could barely breathe. I was really worried. After about 20 minutes, the guy was okay.
The only time I've ever tried the Scorpion crunch is when someone tries the Can Opener. I've never tried to get the tap with it, but it's pretty effective at stopping that. Plus it's a poignant reminder that douchy moves beget douchy moves.