That is a horrible situation. I'm really sorry for this individual. But becauseof stories like these it causes me to double check everything. I always check for a triple knot when joining top and bottom sections. Feel and listen for bends or weirdness when climbing. Someone mentioned about leg circulation being hindered from the Seat of the pants. I don't think so. IN the military we had to tie a swiss seat while repelling from cliffs and helicopters.A swiss seat is just a fancy rope tied around and between your legs.We were just fine. The best thing is to keep your head and for me ....don't go to high....and never climb a tree without Jesus
Chuck