Actually, I believe Ents can easily just ignore Sauron, as they ignore the rest of the world (usually, until Merry and Pippin come along), because they are natural parts of the earth, basically plants! They sre so connected with the earth that they can't be controlled. It's hard to explain. Do you know what I mean? They don't care that much either way as long as plants live. Anyway, it's just my opinion on the matter.
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