https://www.google.com/url?sa=t&sou...FjAAegQIARAB&usg=AOvVaw001QYLbqfm--NLsg5Cn6mH From things I've observed with the beetle kill ponderosa pine while felling them is a lot of them were starting to rot at the Stump. I had one that just stood straight as I pounded stacked wedges in and I noticed one wedge was an inch into the upper part of the cut. I left the wedges for support and moved up ten inches above my prior cuts and took the tree down. The tree felt solid before I made the first cut. This is just my thoughts on what may have lead up to this accident and maybe somebody will learn something from this.