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Mei can cover the area around her and some more with Acid Mist just like
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. Now, how is he going to restrain her with Mokuton when as soon as the branches come in contact with the mist (That Mei will be in) they disintegrate? She is never getting restrained when she has Acid Mist.
Not to mention this strategy would assume that Yamato is close enough to do so, thus being in the Acid Mist, meaning he also gets melted.
Any attack of his gets close, and all she has to do is blow on it with some mist like she did
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, and effortlessly disintegrate it.