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It will be interesting to test whether one can react fast enough if a drone like this approaches from a shallow angle from the side. It could even approach in free fall the last few meters, so it would be almost noiseless: https://www.youtube.com/watch?v=VxOdXYCRAds

I think a new quality about this kind of weapon is that it can be controlled remotely or can even operate semi-autonomously. Deadly pipe bombs are certainly heavier than a crossbow and ignition mechanisms aren't trivial to build.

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