Is it? If the drone's flying over my property, over the tree line, and my neighbor shoots it, it'd have to be at an angle where there's nothing directly behind it.
"4. Identify your target, and what is behind it." is short for wherever the bullet or shot will end up, be it deflected if you're shooting at a surface at a low angle, or in an arc coming down. For shotguns, it's fundamental to be aware of where the shot comes down.
