I realize that this won't do the slightest good, but the Tip was meant to illustrate the application of a vertical technique in a horizontal plane. Please go back and listen to the commentary.
I realize this won't faze anybody, but the dummy is a purple belt with a bum knee. If you do this tech with your knees down, and you dummy up sloppily, your knee tends to get torqued rather badly. There is further discussion of this on KenpoNet.
I realize that several won't believe this BUT I HAVE DONE THIS PARTICULAR TECHNIQUE BOTH AS A DUMMY AND ON THE GROUND, WITH KNEES ON AND OFF THE MAT. It is, in point of fact, very difficult to reach the face with punches unless at least one knee is down. When you get your knees down, lean in and swing hard and fast, you get hosed--unless, of course, they freeze.
I realize that this will simply be read as more evidence that I am a hidebound traditionalist with no understanding whatsoever of What Can Happen, but personally, I've been running one tech or another for peeling somebody off since 1993. At that same studio.
And I realize this is likely to get ignored, but I a) am quite well aware of most of the biggies in grappling, b) have indeed practiced this stuff but am by no means a genius at it, c) have indeed learned stuff from these arguments.
Again, I'd like to see demos of grappling techs--shown for the same reasons, to illustrate a concept--considered to be more realistic. I will bet you a shiny new nickel that I can come up with just as many objections, all based in complaining about realism.
I am also quite acutely aware that martial arts instructors can set things up to make themselves look good, and so limit the nature of attacks and responses, and so condition their students to over-respect them, that nothing real gets taught. I have a pretty good idea of how this happens, too, so I tend to be skeptical and watchful. No matter who's the head of my school. Can all of you folks say the same?
There is no such thing as a perfect, invulnerable technique.