It discharges the high voltage/low amp static field. Without it the discharge could knock you out, though not kill you. Very similar to the technique used in heli logging before grabbing the hook. It must be discharged before grabbing it to connect a choker. The charge comes from the rotors...
People like that are the unsung hero's that keep the world turning. Truly a pleasure to see the working man be recognize for his contributions. Most excellent video.
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