The Avatar can bend earth. Kryptonite is a rock. Therefore, the Avatar can bend kryptonite. So Aang wins.
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The Avatar doesn't know what kryptonite is, how it affects Superman, where to find any, or how to synthesize it.
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The spirits will tell him all he needs to know.
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Most of the Kryptonite is in space, in the desolate ruins of Krypton, possibly thousands of light years away. How the hell is Aang going to retrieve some even with plot shielding?
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Then he can only win via outside help. Superman wins by default.
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The spirits of past Avatars technically aren't other people.
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But what about Scenario 2?
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What about it? It's still outside help.
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Yeah, but given to both sides Basically the largest amount of plot shielding Superman has ever gotten against the largest amount of plot shielding The Avatar has ever gotten
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Superman could fly near the son, supercharge his cells and become invincible to Kryptonite.
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Let And Im Here Too be witness to this rebuke