Sozin's Comet is only three days away. Zuko tells the others what the Fire Lord plans on the day of the comet and the gang realizes that they must stop him before then. But Aang doubts that he can do what is expected of him.
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[Zuko training Aang in Firebending
More ferocious! Imagine striking through your opponent's heart!
Now let me hear you roar like a tigerdillo!
[Aang gives out a weak roar
That sounded pathetic. I said roar!