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In terminology used by scientists, the black hole may have "recoiled" - a phenomenon that occurs when two relatively smaller supermassive black holes collide and merge to form a single, larger supermassive black hole.
After having his retina surgically reattached, Bob made sure none of his firearms recoiled very hard or fast, mostly shooting gas-operated shotguns, since they stretch out recoil time, and never had another problem.
Upon firing, as the barrel recoiled rearward and the empty case was extracted, a lifter brought a fresh round up into alignment with the breech.