It seems that he was hiking with two other people. They took a break for lunch and peeled off some layers. They then decided to jump across the canyon to get to the other side. Russell was the last to jump. He simply forgot to pick up his jacket. One side of the canyon was higher than the other side of the canyon so it was not hard jumping across and down. But, they could not figure how to go back. Even when we arrived at the scene, Russell walked around for about 45 minutes trying to find a way across. I spotted the route that he eventually took to cross the canyon. I'm no mountain climber, but it seemed to be a reasonable approach. It worked out in the end.