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Interested what the full story is, i.e. did kiwi bushman hear bullet(s) flying by or impact near him, or did he simply hear a shot or shots?

You might at a pinch use a firearm to defend your life, and I think the law would back you up. For defending your privacy I'd maybe just stick to throwing rocks.

Here is a useful idea for when...

Maybe reckless discharge of firearm, or discharging a firearm in a way to cause nuisance. You'd certainly annoy the drone "pilot". And you might be on video. Would not look good either way. More...