Avatar: The Last Airbender, Book 2: Earth

Zuko:
Uncle, I don't understand. What are you doing with the Avatar?

Aang:
[faces him] Saving you, that's what.

Zuko:
[makes angry noise and attempts to lunge at him. Iroh holds him back]

Iroh:
It's time we talked. [to Aang, smiling] Go help your other friends. We'll catch up with you.

Aang:
[bows to Iroh and rushes out with Katara]

Katara:
[stares sadly over her shoulder at Zuko as she leaves]

Zuko:
[not looking Iroh directly in the eye] Why, Uncle?

Iroh:
[seriously] You're not the man you used to be, Zuko. You are stronger, and wiser, and freer than you have ever been. And now you've come to the crossroads of your destiny. It's time for you to choose. It's time for you to choose good.

Zuko:
[eyes widen and makes a loud sound of surprise as the green crystals shoot up and imprison Iroh]

Azula:
[comes over with two Dai Li Agents behind her] I expected this kind of treachery from Uncle. But Zuko, Prince Zuko. You're a lot of things, but you aren't a traitor, are you?

Zuko:
[angrily, eyes narrowed] Release him immediately!

Azula:
[slyly] It's not too late for you, Zuko. You could still redeem yourself.