Not sure how to explain this. A type of submission I always thought may work and have seen opportunities for it in a number of fights .
Fighter gets back mount. Trying for choke, using a figure four around opponents waist. Fighter defending ( as some do) is throwing punches behind aiming for head of aggressor .
As fighter throws punches some tend to leave their arm and fist behind their head once they've found their target. At that point the back mounted fighter grabs the wrist trying to punch him with their hand from the opposite side ( uses left hand to grab right wrist for example) both fighters remember are facing same direction. Pull wrist down behind their back and away ( as above right wrist being pulled down and to the right). Next with other hand grab elbow ( same arm as wrist, most likely elbow will be pointing up at this point) again push down on elbow for extra leverage.
This should cause instant pain and rip muscles on arm and shoulder. If no tap could possibly break shoulder.
Not sure if I wrote this clear enough. Has anyone seen a sub like this?
Reach your hand being your back, if someone grabbed your wrist and pulled down... it would hurt, they aren't me to bend that way.. Also leverage to pull out diminishes compared to other subs.
With a tight figure four it would be very hard to defend .