There's already a lot of good information here.
I liked Mike's initial response.
Mike K wrote:
As with anything there is an early phase, mid phase and late phase, and what you do may be different upon which phase you are in.
This reminds me of a pint-sized female student asking what to do if a bad guy lifts her up in the air with a Full Nelson. My response? Don't let yourself get in that advanced state of control loss. Anticipation and preemption rule when it comes to things like head locks.
Two people get a vote in this situation. One is attempting to execute the headlock. The other is attempting not to be in or stay in the headlock. Both have things they can do to execute their battle plan. The person with the best execution wins.
My special forces instructor had us work briefly with responding to a sudden garret wire choke. He used a shoe string to make his point. After much experimentation with the students, the consensus response was immediately turn 90 degrees and THEN worry about what to do next. If your first move wasn't decisive, then it was all over very quickly.
The key here in the early stages is maintaining control of center. If you have that, then you can turn, rotate, drive, step behind the person's legs for a hip throw, etc., etc.
Conversely the key to executing a good rear naked choke is first to kick the back of the knee. If they suddenly arch back and you get the choke in, it's pretty much all over for the person being choked.
Understanding how this works is important. Blood chokes work when BOTH jugular veins are occluded, preventing venous return from the brain. No venous return means no arterial blood coming in, which leads to a KO in 5 to 10 seconds. If you manage by rotation or whatever to free up at least one of those jugulars from the vice AND you can keep the airway protected by keeping the chin down, then you still have a fighting chance.
If you are in the advanced stages of a choke and you don't trust what will happen afterwards, then this is the time to put up or shut up with the pointy/grabby techniques. Are you willing to stick a thumb in the eye and pluck an eyeball out? It's not that difficult physically. It is however psychologically a difficult thing to do. Are you willing to reach and grab a testicle and crush it? Can you stomp a foot? Can you bite whatever until the flesh is in your mouth? These are the last-ditch effort things you have at your disposal.
- Bill