When you have full melee energy, Shotgun final blows activate your Defensive Strike and consume your melee energy. Shotgun final blows also give you melee energy.
Shotgun and melee final blows start your health regeneration. While you have a defensive buff (Void Overshield, Amplified, Restoration, Frost Armor, Woven Mail), your Shotguns and melees deal additional damage and final blows with either extend the duration of those buffs. Provides a moderate benefit to Shotgun airborne effectiveness and reload speed.