Butterfly: inside heel hook / sweep

DilemmaProficientCONCEPT-DIL-BUTTERFLY-IHH-SWEEPThe hook decision — sweep if the top stays grounded, heel hook if the top postures up

Modern butterfly guard attacks operate on a shared mechanical platform with the leg-entanglement family. A butterfly hook on the top player’s same-side leg, with the bottom player’s outside hand controlling the sleeve or wrist and the inside hand pummelling the underhook, simultaneously threatens a sweep (lift the hook, dump the top player) and an inside heel hook entry (drop to the back, scoop the leg, secure the hook for the lock). The two threats share the same hook configuration; defending one opens the other.

The dilemma is what gives modern butterfly its reach into the leg-lock game. Pre-leg-lock butterfly was a sweep platform; modern butterfly is a sweep-or-leg-lock platform, with the choice driven by the top player’s posture rather than the bottom player’s pre-commitment.

If the top player keeps their hips heavy and base wide to deny the leg-entry, the bottom player elevates the hook and runs the standard butterfly hook sweep to top butterfly or mount.

If the top player postures up to deny the elevation, the bottom player drops under the leg, scoops to single-leg X or ashi garami, and extracts the heel for the inside heel hook.

inside space controlLeg entanglements require isolating one of the opponent’s legs from the other.

The butterfly hook already separates the top player’s legs at the hip line. When the top player postures up, the same hook becomes the entry point — the isolated leg is already there. The dilemma is enabled because butterfly’s primary mechanic (single-leg elevation) is also the leg-lock entry’s precondition.

hand posts create offenceGuard sweeps require breaking base in one of two perpendicular directions.

The butterfly sweep breaks base laterally by elevating one hook. The leg-entry breaks base by collapsing the same hook into the ashi-garami pocket. Both attacks operate on the same single-leg base; the difference is whether the leg is elevated upward or scooped under.

heel exposure by positionHeel hooks require the foot to be controlled past the hip line, with the heel exposed.

The inside heel hook entry from butterfly satisfies heel exposure by position by routing the top player’s leg across the bottom player’s chest after the postural break. The same butterfly hook that elevated the leg now scoops it into single-leg X position with the heel exposed for the lock.

force angleA defender cannot defend two threats simultaneously when each defence creates the other’s opening.

Posturing forward to deny the heel hook entry opens the sweep elevation; staying heavy to deny the sweep opens the heel hook scoop. The top player’s posture choice directly determines which attack lands.