Well my initial impression would have been a handheld saw (those we rednecks refer to as "Skilsaws") cutting at just above waist height and at the end of the cut he allowed the saw to drop, either from fatigue or lack of attention. So many carpenters I know tie the safety shields back on these things. Lessons like these show the need for them. I guess another possibility could have been a benchtop table saw that wasn't secured and vibrations allowed it to tumble into the man after making a cut. Either way, I shudder at the thought every time.

In case you wonder, my father was a maintenance supervisor for over 20 years and I've worked in machining for as long so I've seen quite a few Einstein ideas turn tragic.

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As to marriage or celibacy, let a man take which course he will. He will be sure to repent - Socrates

Love is not looking in each other's eyes, but looking together in the same direction - Antoine De Saint-Exupery