RE: "Something moved...and he fired."
How awful, My prayers are with all involved.
We as hunters can't stress safety enough. Be active...whether its working with a local hunter safety program or intervening with someones personal business if you know they allow youngsters to hunt alone. Heck if the neighborhood kids are mishandling BB guns get involved and be heard. No sense in letting bad habits form at early ages. Bad enough that movies and video games highlight shoot-outs which is different than a hunting accident but still shows our youth a fuzzy line when it comes to firearm safety.
Again My prayers are with all.