I see nothing wrong with what happened. It is not ike they could not hear the helicopter above, and they know it is not a Bathe party helicopter. They knew pretty well they were playing with fire by running around and hiding stuff. Play with fire and you might get burned. The caliber of the weapon means nothing. Dead is dead, whether it be done by a BB gun or a 30mm gun. Probably a lot quicker death with the bigger gun so IMO more humane.