someone loading ammo in a gun on a movie set. somebody is getting ready to shoot something and they take the ammo and you want to see it being put into the gun. so since we don t want actors handling live rounds, we give them a casing that has no powder in it, no primer on the back, but it does have a bullet. so on the outside it looks like live ammo. if you put this into a gun and then say we re done with that now we re going to the blanks. you pull this out of the gun and if the bullet unseats from the casing, the bullet could actually be still sitting inside of the cylinder and then when you take a blank and you put it behind the bullet inside of the cylinder, you now have primer, casing, powder and the bullet that you didn t realize was in there and that is how brandon lee was killed. so they brought all four components of a cartridge together in the gun unwittingly and that is how that homicide