Prayers for the family. A sobering incident like this always leaves us with a multitude of questions, and almost always could have been prevented in one way or another... Judgement and complacency in the moment always leave something to be desired, ask me, I know... Familiarity breeds complacency. I rec climb and do some arborist work at height, so I do understand some of the challenges, but you will never fully realize the mental/physical state of the individual during the stress event. Therefore, it is always best to focus on prevention vs. solution to the problem. Not saying that knowledge to solve basic issues should not be practiced or familiar. Be safe out there people, and run your saw with two hands away from your ropes!