Almost 40 years ago, I was one of the original members of the Baltimore chapter of the Guardian Angels. After the guys who came to Baltimore to train us moved on, the chapter ended up under the command of a young lady named (if my memory isn't failing me after all these years) Cissy Henson. She was short, black, built like a Sumo wrestler, and would scrap and spar with any guy in the club.
One of the exercises we would train was calling "time" on a subject. The idea was for a patrol's worth of Angels to just surround a suspect in a circle and detain them for the cops. We weren't supposed to initiate any violence. But we would practice encircling one of our members and seeing whether they could break through the circle and get away.
Around this time we had a guy join use for a while who claimed to have been a Navy Seal. I don't know whether he was telling the truth, but he was strong and tough and had a military bearing. When we put him in the middle he didn't have much trouble punching a hole in the circle, knocking down anyone who got in his way, and running away faster than we could catch him. Then the though occurred to him, based on his military training, that he should begin by taking out the leader. So the next time we put him in the circle, he tried to tackle Cissy on his way out. She sprawled, tied him up, stopped him dead in his tracks, and the rest of us just calmly walked over, grabbed his arms and legs, picked him up and laid him down on the floor.
Funny thing was, I don't think that Cissy had any official martial arts training that I ever knew of. She was just a tough woman who knew how to brawl. If she had actual training she would have been really scary.