Oh man! I can just see that happening to me. By pure luck I haven't broken any bones yet (that I know of) but I have fallen out of a tree. Even worse, I was standing on a branch trying to start my chain saw when the extra stress on the branch of me pulling the starter rope broke the branch. Lucky the saw did not start and both of us hit the ground about 8 feet (or more?) below. Bent the bar on the saw and bruised my ribs where I hit a branch on the way down. Got away lucky and a little wiser. Now I borrow an electric pole saw.