Avatar: The Last Airbender, Season 3

Fire Sage:
By decree of Phoenix King Ozai, I now crown you Fire Lord...

Azula:
What are you waiting for?! Do it!

[She looks up to see Appa landing in the square, with Zuko and Katara on his back.]

Zuko:
Sorry, but you're not gonna become Fire Lord today. [jumps down] I am.

Azula:
[laughs] You're hilarious.

Katara:
And you're going down!

[The Fire Sage attempts to crown Azula, but she stops him]

Azula:
Wait. You want to be Fire Lord? Fine. Let's settle this; just you and me, brother. The showdown that was always meant to be! Agni Kai!

Zuko:
...You're on. [Azula grins]

Katara:
[to Zuko] What are you doing? She's playing you! She knows she can't take us both, so she's trying to separate us!

Zuko:
I know, but I can take her this time.

Katara:
But even you admitted to your uncle that you would need help facing Azula!

Zuko:
... There's something off about her. I can't explain it, but she's slipping. And this way, no one else has to gets hurt.

[Katara nods. Zuko and Azula take up positions at each end of the square.]

Azula:
[sneering] I'm sorry it has to end this way, brother.

Zuko:
[grimly] No, you're not.