Let's not forget Fangorn is quite big. Treebeard and others were also there and did nothing. That's one thing; second: even Saruman (or his "ghost", apparition, whatever it was) was out there (a bit later) and nobody did anything (although it is true that one apparition of Saruman probably does much less noise than a band of warriors). Last of all, however: didn't, by any chance, Gandalf just at that point stand "on a high place" and battled with his will against Sauron in order to turn him away from Frodo? I believe this particular event occured just when Gandalf was in Fangorn. Somebody correct me if I am wrong. But it was certainly supposed to happen around that time, and I think in some timeline draft of Tolkien's it was even confirmed to be that way.
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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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