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Water, something so vital that was opposite to what he was. Yet he needs to sustain himself with water. He never noticed that she gave the last drop of water to him, but then again he had a fever, and she was trying to heal him.
For the first time, Zuko started to appreciate how water was truly something special, and something that he needed.
He fell unconscious, while Katara was trying to heal him. And the next thing Zuko noticed that he was in a lake, soaking wet.