Possible armour-piercing question - all episode, Aang was saying that Katara shouldn't kill the guy who killed her mother, even going as far as giving a weird, in-universe variation on the old 'double-edged sword' saying. At the end, Zuko says that Aang was right about violence not being the answer. Aang cheerfully replies, "It never is." Before the episode ends on a nice, happy, Aesop-y note, Zuko says, "Then I have a question for you. What are you going to do when you face my father?" Cue Aang looking worried and omnious music.
Possible armour-piercing question - all episode, Aang was saying that Katara shouldn't kill the guy who killed her mother, even going as far as giving a weird, in-universe variation on the old 'double-edged sword' saying. At the end, Zuko says that Aang was right about violence not being the answer. Aang cheerfully replies, "It never is." Before the episode ends on a nice, happy, Aesop-y note, Zuko says, "Then I have a question for you. What are you going to do when you face my father?" Cue Aang looking worried and omnious music.