The wizards duel is something that drives home, to none Tolkien fans, that Saruman is the best and most powerful. It sets up the two towers when Gandalf comes back and takes Sarumans staff and breaks it. It shows how much more powerful Gandalf becomes.
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Keeper of the site Ring Lord.
"Dangerous!" cried Gandalf. "And so am I, very dangerous: more dangerous than anything you will ever meet, unless you are brought alive before the seat of the Dark Lord."
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