re: Avatar: The Legend of Korra Books 3 and 4 Thread (Book 4 premieres in October)

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He studied the Air Nomads all his life and was a strong follower in Guru Laghima. He also had only one attachment to the world and she died.

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Tenzin is the son of Avatar Aang, studied under Aang his entire life and could never enter the spirit world outside of the portal. Studying and practicing these things are 2 different things. He couldn't even put airbending techniques to use until a few months prior.

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Kind of hard to fight someone who is flying and Korra was quickly dying. She would have died had Suyin not saved her.

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I get that she was dying, but he had full mastery and complete control over a newly acquired technique against the Avatar who can fly as well using fire bending or air bending herself.

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Plus I believe the poison was mercury

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I figured as much, but then when it comes to how metal bending works and what elements they can easily bend, they never really say what determines a metal's ability to be bent other than saying a metal as pure as platinum being unbendable. Since mercury is further down the periodic chart than platinum, I'm assuming they are referring to a metals hardness.