This actually reminds me of a seminar we ran on Saturday. The seminar was focused on ground fighting with edged weapons ("traditional" knives and karambits) and "combat" grappling/take downs. I put combat in quotes because it was based on the idea that unlike say LE or Security in self defense you want to break joints and tear muscles so you can escape. It was an amalgam of Chin Na, Kali and Silat techniques.
I actually got a tad frustrated at one point. I was partnered with a person when it came time to perform a technique that controlling the arm, hyperextensions the shoulder while using head control to take the person down. My partner insisted on keeping their feet planted until I had hyper extended their shoulder to the point they were literally shouting..."ow ow ow my shoulder, my shoulder, my shoulder."
Eventually, politely but firmly (to hide my frustration) I said,
"in a real fight I wouldn't have stopped when you cried out. I had control, you didn't and so you would have had only two choices. 1. Go with the flow and to the ground where yes I will have even greater control. 2. Have me dislocate your shoulder, and still end up on the ground and now I DEFINITELY have greater control. We arent simply learning today how to perform the takedown. We are also learning how to properly go with the flow so that if someone does it to you, you still have a chance of defending yourself."
Now with that particular technique if I apply the correct leverage I can, if I wish to be brutal, virtually dislocate the shoulder at will. The simple fact it was almost happening because of a rigid uke makes that almost a certainty. I get that the Sifu put me with them because he knew I had the control not to hurt them (they had apparently been doing that all day in one shape or another) but it was still frustrating as hell because when I train I like to train hard.