"Well," says Zuko, trying to figure out how to explain it.

"We were enemies for a long time. That's how I got to recognise them, I suppose. I joined them quite recently. I- made a lot of mistakes, and it took me a long time to realise how many and how completely."

His expression is stony. He has a lot of regrets, mixed with anger and guilt... an then there just feeling stupid. He hates that.

"I... we're not exactly friends." Except, ironically, perhaps for Aang. "We're allies."