There are a lot of free-running GoPro camera videos out there but there this one ups the ante in the viewer queasiness stakes.
It's up to you to decide which isthe craziest part of the video. Is it the back somersault on a narrow bridgehead, or hanging hundreds of feet in the air with only your mate's arm between you and certain death?
Who can say. What we can say for sure is that no one will release a headcam video this insane until, oh, maybe two days from now?