I wonder if he actually died, he was already undead and working to right the wrongs he committed so maybe he can't die until he does
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I think Skeleton Guy said something about being put him in the ground preventing him from doing his deeds so he would be stuck there forever. I am hoping helping me into the window was the last needed good dead to right his wrongs. Either that or he just has to fertalize the ground with his remains, also known as probally just dust.