Kite-flying in a thunderstorm leads to pseudo-telekinesis

Kite designer Tim Elverston sent in this video through Submitterator, showing his friend making a piece of kite line move "magically" with the help of static electricity. Also, they got shocked. If you listen to the video through headphones, you can clearly hear an electrical buzzing every time their fingers get close to the kite line.

Interestingly, the effect seems to have been dependent on the line material, and the bench the kite was tied to—both of which were made from plastic composite.

The two other identical kites flying in the same conditions were not doing the same thing. They were flying on different line material, and tied off to different things, a person and a wooden fence. There was visible lightning and electrical activity in a storm that was about 1-3 miles to the West of us. The only other two times I have experienced this were both while riding in my kite buggy, and I started to get a shock through my leg to the metal frame of the buggy.