In the book it could be interpretated that way. But I always thought of it as if that it was some sort of "sixth sense move" from the Watcher, and that it didn't have anything to do with Sauron. Though your interpretation is equally possible (as we know Sauron stirred all evil creatures around that he found. I'd like to call the Watcher an opposite of Gwaihir, as Gwaihir was likewise summoned by Radagast).
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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