Thanks for posting this. It is a sobering reminder that mistakes do happen, even among people who know better and have run saws/dropped trees/limbed up/worked blowdowns and snags/etc. time and time before. The risks are real, and there isn't a reset button. What happened here was one step away from an unhappy ending. It could happen to any of us, frankly. This past year Caseyforrest's father-in-aw was killed by a tree he was cutting, in his own yard; he died many years before his time.
The difference between a close call, an injury, and getting killed can be mere inches, seconds, a small wind gust, or something like that.
Be careful out there, guys! This saw stuff may be fun, but it isn't risk free.