The Gaining Momentum Procedure (GMP) is resolved once, immediately after each Action, Ability, Spell, Gambit, or Divine Will finishes resolving. It is not run after an inner Step or sub-Procedure on its own, nor at a Sequence or Phase boundary, and it never triggers off itself. When GMP fires: once, right after each completed Action or resolved effect. • A Melee Attack Action - check once when the whole Action ends at Melee Attack Action Procedure Step MEL:80 End of Action. A Tactical Formation Procedure won inside that Action counts here, at the Action's end, not as a separate earlier check...