The flash was probably discharged, and the shutter left open until the gun fired. No problem to do if dark enough. Or it could have been done in the reverse order, but that would probably depend on how much recoil the gun had (otherwise, the barrel flash would probably not match up with the barrel location in the flash-illuminated shot).
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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