Purpose

The rear triangle becomes available when the partner defends the RNC by placing their arm over the attacker’s choke arm — typically by reaching up and pulling the choke arm down toward their chest. This defence effectively prevents the RNC by removing the neck placement. A practitioner who does not have the rear triangle as a response will be left holding a broken choke attempt from back control. The Elite practitioner uses the arm-over defence as the trigger for the rear triangle entry.

This drill trains that specific transition: RNC attempt → partner defends with arm over → rear triangle lock.

Setup

Full back control: seatbelt established, hooks in or body triangle, hip connection active. The attacker begins the RNC entry sequence. At the moment the over arm slides toward the neck, the partner uses their near arm to reach up and hook over the attacker’s choke arm, pulling it down toward the partner’s chest. This is the drill-starting condition.

Execution

Step 1 — read the arm-over defence: The moment the partner’s arm comes over the choke arm, the RNC is blocked. The attacker does not continue forcing the choke.

Step 2 — trap the defending arm: The arm that was attempting the choke now traps the partner’s defending arm by pressing the partner’s arm against their own chest. The choke arm and the partner’s defending arm are now together against the partner’s chest.

Step 3 — bring the near leg over the shoulder: Release the near leg hook. Swing the near leg over the partner’s near shoulder to begin the rear triangle configuration. The back of the knee should be across the front of the partner’s shoulder.

Step 4 — lock the triangle: The far leg hooks under the near ankle. The triangle is locked.

Step 5 — confirm squeeze mechanics: Squeeze the knees toward each other while maintaining back connection. The blood choke acts on the carotids as in any triangle — the partner taps when the compression is felt.

The drill runs both sides.

Coaching Notes

The rear triangle drill requires that both practitioners already understand the standard rear triangle position. This is not a drill for introducing the position — it trains the specific entry trigger (arm-over defence) as a programmed response. Running this drill on practitioners who have not already trained the rear triangle position will produce confusion during the leg swing (Step 3).

The transition from Step 1 (choke attempt) to Step 2 (trap the defending arm) must be seamless — the defending arm reaches over, and in the same breath, it is trapped. Any delay allows the partner to pull the defending arm back and reset. The trap is a consequence of the over-arm movement, not a separate step that follows it.

The leg swing (Step 3) is the highest-risk movement in the sequence for practitioners learning this transition. The near leg leaves the hook position — back control is momentarily reduced to hip connection and one hook. If the timing is wrong, the partner can use this window to turn out. Train the leg swing to be fast and continuous — it should arrive at the shoulder before the partner can identify the window.

Common Errors

Continuing to force the RNC after the arm-over defence: The choke is blocked. Continuing to force it compounds the problem — the partner can now double their defence by adding the second arm. Switch to rear triangle the moment the arm-over appears.

Leg swing too slow: The near leg leaves the hook and pauses in mid-air while the attacker recalculates. The partner escapes the back during the pause. Train the swing as one continuous fast movement.

Triangle lock on the shin rather than behind the knee: The near leg needs to be over the shoulder at the crook of the knee (the back of the knee against the top of the shoulder). A shin across the shoulder does not provide the lever needed to complete the lock.

Loss of back connection during the lock: Both practitioners end up face-to-face rather than back-to-back. The rear triangle should be applied while the attacker maintains a back-attached position — not by sitting up in front of the partner.