I am not for sure, but I don't think a Maia could kill another Maia. The Valar did not kill Morgoth even for all his heinous crimes, but perhaps they had a lot of mercy. But doesn't Gandalf exhibit mercy towards Gollum/Smeagol, and didn't he learn much wisdom from Nienna the Weeper? How could he then 'kill' another kindred spirit. Both the Balrog and Gandalf "died" on top of the Endless stair, but neither of their souls died.
And men's spirits go to the halls of Mandos, Farael. They do not leave Arda entirely, but go to Valinor.
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"For with much wisdom comes much sorrow, and with more knowledge comes more grief."
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