Yes, mabey there is Nemenorian powers hiddin in Orthac that not even Saruman knows! And i'm glad that Isengard went to the Ents, because we deserve it  I wonder if Aragorn ever visited Isengard...
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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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