I agree with the idea of Grima slinking around Orthanc and coming upon Saruman secretly using the Stone. More than once, probably. Also, I think that in the heat of the moment, Grima probably DID want to hurt both wizards, and he chanced to be in the same room as the Palantir, so he thought "Oh, Saruman loves this stone eh?" (Or something to that effect.) So he chucked it.
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"There's a big...machine in the sky...some kind of electric snake...coming straight at us."
"Shoot it," said my attorney.
"Not yet...I want to study its habits."
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