My take on it is that even if the two Blue Istari can overpower it, they can't kill it because evil as it is, it still derives its existence from Eru. It must be cast into the Void. Do the Blue Istari have the power to do that? If not, then it must be imprisoned over again somewhere in Middle Earth. Those are the options as far as I can figure them.
I seem to recall that Nerindel had a character (not Mara) with a rather potent sword... ?
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