Throughout the series a major theme was what the world expected from Aang as The Avatar and what he wanted himself. The very reason he ended up in the iceberg to begin with was because of his fleeing from his responsibilities and those who "interpreted them" for him. The first episode of Book 2 shows just what happens when someone tries to "Deconstruct" his powers and use them.The final stressed this beyond belief. His friends, his selves, and the world itself seemed to stress him to do one thing, but Aang was able to finally think for himself and yet still save the day IN HIS OWN WAY.