Oh man. XD Some people really shouldn't be out there hunting...

Personally I appreciate the lack of clues in the beginning here, and a bullet can travel a looong distance, so it doesn't seem like a loose end that nothing but the duck's shown at the start. He just misses the duck. Anything can happen then. If it'd be more fun if he intentionally shot the kid though hmm... that just feels morbid IMO. Maybe just some kind of response, to make it clear that he was intending to hit the duck? I feel it'd lose some of the comedy factor if that wasn't actually the intention. But who knows.

I feel for the duck here. That expression's gold. And the end twist: all the greater when you just didn't see it coming! Really had a laugh out of this, dark humor though it may be. Good stuff.

-cd-

In the first scene we can see neither the tree nor the family. Creating a surprising outocome is one thing, but in this case it depends on consistency of the surroundings and camera angles.
The way it was portrayed I don't even know for sure if this guy is a hunter or a hitman.
Did he miss? I don't know.
The guy says "Stupid little... something". Why though? Did he miss before to be annoyed or what?
I'd focus on consistency first.