My guess, after being involved in a few hunting videos, 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.
That would make sense. There were probably even several takes taken both of that and the scene at the elk.
_________________________________________________________________________ “Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
