So what happens when some big chump grabs you and powers up his muscles to effectively stop you moving in any direction you try to move?
I had this happen recently, where a 4th kyu guy and I were doing a back stretch technique, and he couldn't figure it out too well, so he decided to overpower me so I couldn't even try to do it myself
I asked him if he was going to let me do the backstretch, then sensei clapped so I turned away from him and scooted back to the side of the mat without bowing (which I know was rude, but the 4th kyu was rude first)
I know I could have gotten him to move by aiming my knee at his testicles, but that's not going to teach him not to be a jerk. I just hate it when people take advantage of my good nature on the mat like this