(You and Zuko are 18. Katara is 16. Sokka is 17. Toph and Aang are 14.)
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You were currently in the Western Air Temple. Doing some training on your own. Some stability training.
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Your stomach was fully exposed, because your shirt had fallen down when you went into your handstand. And a bit of your chest as well. But you didn't care.
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Toph and Aang were outside, playing with Momo and Appa. While Katara was exploring. And Sokka was training with his boomerang.
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You were doing a handstand. Trying to hold it for as long as possible. When you heard footsteps. You didn't move, but listened to who it was.
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It was Zuko. It seemed he was looking for somewhere to train alone as well.
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Zuko: "Hey- oh. What the hell are you doing?"
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You didn't move. You just stayed in your handstand. Your legs moving around in the air, trying to keep them up straight.