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Originally Posted by Kath
I was under the impression that the palantirs communicated with each other...
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Me too,
Kath. Maybe it was just through Gríma, or maybe Gríma had minions of his own: weaker minded Rohirrim who had grudges against the king, Théodred, or Éomer. We saw them in the movie, punching Éomer and attacking Aragorn and Co. (only to be kung-fu-ed
). They could quickly carry messages from Edoras to Isengard without Théoden missing Gríma, and without Gríma missing a beat to keep Edoras under control.
Here's an interesting tid-bit about Gríma: Only he himself and Théoden (only when he's still not completely healed) call him just plain "Gríma" and not Wormtongue. Not even in the narration is he called Gríma. Always Wormtongue.