Inside Heel Hook
A high-leverage leg lock from the saddle position that isolates the tibia. It works by pinning the heel against the armpit and ribs while rotating the lower leg, creating immediate torque on the knee joint.
6 steps
· save to drill into each- 1Establish the saddle position with tight leg control to prevent knee freeing.0:46
- 2Fall onto your left side to free your right arm.2:01
- 3Bend the opponent's knee by gripping around it and using your armpit.2:30
- 4Pinch the heel between your tricep and ribs, avoiding the armpit and elbow.3:11
- 5Connect palms and lock elbows tight to the body.3:55
- 6Rotate the tibia by lifting elbows and moving the armpit.4:10
Source video

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Then the round started — and you forgot it.