The young men could not uproot the tree themselves so they asked the chief for help, the chief was able to uproot and bring the tree to its side so when the wife went to balance herself on the branches, she fell in a body of water below it.
Welllll, I watch a lot of supernatural and of course I find that a lot of the logic that comes from that seems correct. I think that you would need to burn a body if you don't want the spirit to live on... The mind is dead once you die.