>>11455182You should look up frames of reference in the context of physics.
But I'll try to explain. Let's say you are frame of reference 1 (gun), someone not in that frame of reference will be frame 2. Let's say frame 1 is moving at a constant velocity close to c (say v), then in frame 2s frame of reference, you are moving at speed v. But in frame 1 you aren't moving. So frame 2 will see the bullet come out of the gun but at a tiny tiny amount greater than v but less than c. In frame 1, you'll see the gun go at the speed a bullet flies from a gun "normally"
