One of the James Bond movies had one of them in it. Looks like a good gust of wind and the saw and helicopter would be wrapped in the power lines and fried well done.
I was a helitorch mixer for a couple seasons. Launching and landing the torch required me to be within 6 to 8 feet of the helicopter when it took off or landed. For that pilot to place the saw on the ground and fly backwards and land with a tether is a skill not many can master. That guy does it well.