Man Fails at Rope Swinging Into Lake

These guys came across a rope swing near a lake and decided to give it a go. One of them tried to have a go at it but the rope was very short. So his friend decided to make it better by twisting up the foothold to shorten the rope. When he tried swinging, the rope untwisted and he let go of the handle causing him to crash on the rocks and scrape his back.