.... is the close-ups of getting the kid ready to shoot, and his shooting, were taken after the actual shot. Which is may be why he doesn't seem excited.
I actually SAW the same effect a few yrs. ago on some hunting show. A young man -not a kid- sat by a tree on an open hill side and NON chalantly (routinely) made a shot showing NO emotion at all.
I had taped that episode, so I RE watched it. In one scene the MOON was full and CLOSE to the earth.
In the NEXT scene the MOON was very FAR away!! STAGED for sure.