In an early version of the story, I thought Aang could shepherd a herd of twenty bison.

Katara: [opening narration] Water... Earth... Fire... Air. Long ago, the four nations lived together in harmony. Then everything changed when the Fire Nation attacked. Only the Avatar, master of all four elements, could stop them. But when the world needed him most, he vanished. A hundred years passed and my brother and I discovered the new Avatar, an airbender named Aang. And
although his airbending skills are great, he still has a lot to learn before he's ready to save anyone. But I believe Aang can save the world.

Uncle Iroh: [to Zuko, after Aang has escaped] It was not by chance that for generations people have been searching for him, and now you have found him. Your destinies are tied, Zuko.

Prince Zuko: [after Aang has completed the test] You are my prisoner.
Aang: What? But you said...
Uncle Iroh: I should have explained more. If you failed the test, you'd be free to go. But you're the only one who has been able to pass the test. It is an honor to be in your presence.
[bowing slightly]