I have a friend who is a master of martial arts. He is a large man, an inch or two taller than I, and by his testimony he weighed 255 pounds at the time of this incident.
Kirk, I use that name because it is his name, was instructing a class of tykes in the technique for escaping the grasp of a stranger. He was holding the wrist of a six-year old girl, somewhere between 40 and 50 pounds in weight. He told them, "If you are caught in the grasp of a stranger, to free yourself, stretch his arm out, hop back, and sit down. " She did, and my friend was flat on the floor before he knew what happened. When he looked up, his little student, garbed in her white judo gi, looked down with a big grin on her face and reached out her hand to help him up.