The Radagast possiblity raises an interesting point. Gandalf says, time and time again that he and Saruman look very alike, or at least, that Saruman would have no trouble whatsoever in looking just like him. This brings up the question, does Radagast also resemble Gandalf so closely, closely enough that he could be mistaken for him? As far as I know, no one in the fellowship, except for Gandalf himself, has actually ever seen Radagast, (though, since Radagast lives near Mirkwoods southern borders, there is a slight chance Legolas has.) Maybe, in the eyes of mere mortal all Ishtari resemble each other a great deal. I have usally though of Radagast as looking a lot younger than Gandalf with a beard that, while long has not yet greyed (maybe it the color, brown wizard, brown beard), but then I usally (Christopher Lee or no Christopher Lee) imagine Saruman as looking a lot younger and better preseved than Gandalf, at bit stockier and with a beard that is much shorter and bushier (imagine a somewhat slimmed down Santa Claus, and you'll have the rough idea) an old man to whome the years apper to have been kinder than they have to Gandalf.
If it is Radagast, then maybe, he is wandering around, keeping an eye on the travelers. Radagast would know Saruman has turned (If nothing else, Gwahir would have likey told him when he left Gandalf, or at least the next time the two of them came in contact.) He might even know about the loss of Gandalf in Moria (say, from a bird who overheard it in Lothlorien or somwhere else along the Fellowships path). the "hiding in the shadows" may simply be because he fears the reprocussions of open rebellion against Saruman (I get the feeling that Radagast is no where near as powerful as Saruman, at least in terms of open one on one conflict.) so he hides in the background, and does what he can to help the fellowship. The freeing of the horses is odd, but maybe it's his attempt to minimize the chances of the hunters detection. Horses may make travel faster, but they also leave a much more obvios trail than three on foot (at least two of whom are skilled in woodcraft). It is also possible that, should a Orc scout see three people on foot, he may decide they aren't worth persuing, whereas three riders maigh be assumed to be from Rohan and therefore warranting of an immediate pursuit and attack. as for why Radagast would be in the area in the first place, maybe he is going to talk to the Ents and try to convince them to lend thier help (If there is any "human" in ME who the Ents are likey to really like and trust implicitly, Radagast the Brown is likey to be it).
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