The rifle stock is engineered to minimize the felt recoil of heavy recoiling cartridges. Recoiling nuclei can ionize and excite further atoms through collisions. Heavier recoiling cartridge barrels have been made with integral muzzle brakes. "Double lightning" gives her the ability to shoot recoiling projectiles. However, whereas momentum is balanced between the projectile and the recoiling firearm, energy is not. Guard hairs give warnings that may trigger a recoiling reaction. During firing the recoiling bolt group travels over the top of it, resetting the hammer. He grabs Minerva inappropriately, and she responds by recoiling and slapping him in the face. The quasar SDSS J092712.65+294344.0 is thought to contain a recoiling supermassive black hole. Because of this, the inertia system is only applied to heavily recoiling firearms, particularly shotguns. Full automation is accomplished by means of a recoiling barrel. Part of the energy of the photon is transferred to the recoiling electron. The recoiling electron has much less energy and a jet of particles is emitted. While Shuriki is recoiling from the pain, Sofia steals Shuriki's wand from her. It shows her screaming and recoiling in horror.