Many great authors throw in a little element of chance to show their readers that no matter what, you can't be prepared for everything and cover all your bases. I'm sure that Gandalf, Aragorn & Co. would have gotten one up on Saruman anyway, but the fact that Grima lobbed what he thought was a random stone object at them, which in fact was a palantir, added that element of chance to the tale.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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