Been going through frame by frame of some of the shots fired from NZ, and many shots appear to be blanks, and shells do appear to disappear.
Look at him shoot the boy in the blue shirt. There's no penetration to the shirt, there's no blood.
He shoots a shotgun through his windshield from the inside but the dash is clean and the windshield doesn't shatter.
He shoots someone in the head against a wall, and the hat flies off, but there is no blood.
Frame by frame analysis of the shell casings on the sidewalk simply appear, travel, and disappear into nothingness.
There's no sound of the shell casings.