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He is drawing the spark from the secondary of a flyback. This is a high voltage, and hurts like heck. Especially if you are not expecting it, but it is very low current and it is a high frequency. The higher frequency current will tend to flow on the outside of a conductor. So the current would flow along the outside of the skin instead of through the muscles and heart. This could explain the static field that they were talking about in the video. Still I dont think I would be up to doing these things on purpose though.
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