I have a feeling that the people who keep trying to figure out how to get close to live power lines are not looking at the videos. Please see the explosion at 4:01. Then, imagine the tree is you. That's what happens if you get electrocuted with that amount current.

So, here's another answer to the original question. From a safe distance, find some macho dude in the area who knows everything and has a need to impress people. Inform him that he absolutely should NOT go near the downed power lines because they're a great risk to his life. Being the type of guy he is, he'll figure out somehow if the line is live or not...