Apparently, he thought he saw “the mark of the beast” on his hand, so he cut it off with a circular saw and microwaved it.
I think the words of the sheriff who responded sum it up nicely:
It had been somewhat cooked by the time the deputy arrived,” sheriff’s Capt. Ben Wolfinger said. “He put a tourniquet on his arm before, so he didn’t bleed to death. That kind of mental illness is just sad.