Gandalf Vs. The Witch King

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Originally Posted by Essex

and that's where our opinions differ. I cannot see any supporting evidence that allows (book) Gandalf to use a magic shield to protect himself from enemies. If he could, then the Balrog would not have killed him.

How do we know that it was the Balrog that killed Gandalf the Grey? Maybe it was the exertion - he used up all of his power - or the rarefied atmosphere. Maybe it was a result of the Balrog's fall and death that not actively resulted in Gandalf's demise.