Avatar: The Last Airbender, Book 3: Fire

[In a flashback, the leader of the Southern Raiders Fire Navy division is interrogating Katara's Mother, Kya, to reveal the identity of the last Waterbender.]

Kya:
If I tell you, do you promise to leave the rest of the village alone?

Yon Rha:
[Nods in assent]

Kya:
...It's me. Take me as your prisoner.

Yon Rha:
[ cruel smile] I'm afraid I'm not taking prisoners today...

[Back in the present.]

Katara:
She lied to you. She was protecting the last Waterbender.

Yon Rha:
What? Who?!

Katara:
Me!

(Katara raises her hands and the rain suddenly stops all around them and reforms into a huge dome of water; she sends a rush of water at Yon Rha, transforming it into ice daggers that stop just short of killing him; suddenly, Katara relents and lets them melt)

Yon Rha:
[Drops to his knees in terror] I did a bad thing! I know I did and you deserve revenge, so why don't you take my mother? That would be fair!

Katara:
I always wondered what kind of person could do such a thing, but now that I see you, I think I understand. There's just nothing inside you, nothing at all. You're pathetic and sad and empty.

Yon Rha:
Please, spare me!

Katara But as much as I hate you... I just can't do it