The problem I have with this is twofold. First, it allows the BG to get the gun out of the holster. This is bad for any number of reasons, not the least of which is the danger to bystanders, your feet/legs, side, etc. For if the BG is able to wrench his arm free, you are potentially DOA.
As it was presented to us the BG couldn't get the gun out. We each had the hold done TO US as well as doing it to someone. When I was the doee there was no way I could move my arm even when I had a grip on the gun.
Bill: Someday we will be in the same place at the same time. Check out "Elk Grove Shoot" in Glock Talk State Clubs/California. I have the same user name there. When we are face to face remind me to demonstrate the hold.