1. it tells you in the video, a voltmeter is hooked up to the blade, and when it touches skin/im guessing a lot of things that have electrical current the voltage drops, triggering the catch to stop.
2. I'd guess so, not sure how much of a voltage drop would be needed, but voltage fluctuates a little, my guess is that a human drops it a fair amount
If it did fuck up it looks like it also fucks the blade up, not sure what the warranty would be like with covering blades, probably less than covering fingers though.
Edit : fucking b10
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