Mandible Choke from Back Control
When the opponent tucks their chin so effectively that the arm cannot get underneath, come over the mandible (jaw/chin area) instead. Turn the arm slightly to rotate their head toward the choke, then drive down and squeeze the same as a standard RNC to get a blood choke.
3 steps
· save to drill into each- 1When you cannot get under the chin, come over the mandible — the jaw/chin area — with your arm14:05
- 2Lock up the choke exactly as normal, then turn the arm slightly to make him look toward your choke side — into the choke14:34
- 3Drive down and squeeze — same three motions: elbow down, elbows together, make a muscle14:44
From the source video

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Then the round started — and you forgot it.