To people posting specific techniques, in case you missed it the OP clarified that these are trained fighters he's talking about. The kind of techniques you learned at your YMCA rape-avoidance seminar aren't going to help him.
Getting someone in a chokehold
they are unlikely to be able to get out of it if you do it right.
Why should they bother trying to get out of it when they can simply rotate their throat into the inside of your armpit where you can't choke them, then have a field day on your exposed ribs? Or step between your legs, grab your ankle and smash you onto the ground? Or place the edge of their shoe under your knee, rake across your shins and stomp on your foot? Or reach around and dig their thumbs into your neck?
Or any of a dozen other things that an experienced practitioner will know to do in this situation.
jam your thumb into the pressure point an inch or so above their wrist, as hard as you can.
No. Just, no.
If you have 10 seconds of trial and error to find the right spot, with the aid of an experienced practitioner to help you find it, and the person you're doing it on politely stands there and let's you do this...you might cause them enough pain to get them to say "ow" and shake out their wrist. And if you push
really hard they might feel it enough to continue to be annoyed about it while they bash in your skull for the next few minutes.
Unless of course, they simply rotate their wrist to avoid it. Or never let you do it in the first place because they're too busy punching you in the face with their other hand: A one-handed wrist grab will not hold anybody. You'll need both hands to secure their wrist, which means you'll have no hands free to deal with their other hand.
Again, this might be useful against someone who has no idea what they're doing, but give me all of five minutes in person and I can teach you how to never have to worry about a technique like this ever again. Anyone with a year or two of training will be able to avoid it.
Sometimes, if someone tries to punch you you can sidestep and use their motion to twist their arm behind their back; you can do this with their pinky alone, because people will twist in order to avoid having their pinky broken. It helps if you've had practice.
Yes, it helps if you've had practice. Maybe five or ten minutes with a cooperative partner and a good teacher. It also helps if the person you're doing it on is deliberately giving you a crazy, straight-armed downward swing through the air instead of actually trying to hit you. And if you have all these things going for you, you might just be able to pull it off if the person you're doing it on is just as inexperienced as you are and has no idea how to avoid it.
Some of these techniques you guys are talking about can be completely shut down by something as trivial as rotating your hips slightly. Or by not punching like a retard.
Joint manipulation and grappling techniques take a good deal of time and practice to learn. And unfortunately, many of them are easier to learn how to avoid than they are to learn to do. Anyone who's done any martial art for any significant length of time has had the experience where they sit there, bored, while a junior student holds their arm looking for some pressure point, asking "Is that it? What about there? No? Ok, how about that, do you feel it yet?" And these are students with months of training and a teacher on hand to help them.
Don't expect to be able to do this stuff to somebody who knows more about it than you do.