Just give up the back clinch because of this cycle. You have escape options and denials there.
The defender can actually land a sneaky knee to the body right before they retake the back each time to trade that knee to the leg, but this doesn't really pay off because the attacker can get an instant takedown if they want during that knee. This is just a fun trick if someone is willing to keep doing it, and you are willing to be ok with some good body damage dealt and one leg left.
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