[Zuko's expression basically makes him shit his pants, to be honest. There's clear fear in his body if you know where to look for it. That said, if you don't - his body becomes even more tense, his expression hardens, and he looks ready to leap back. Acrobatics and strength. Those are his fortes, and so he actually bends his knees to be ready to make use of it, ignoring that he's indoors. But then...
Katara admonishes him. And in doing that, he flashes back to a long, long time ago.
"What about that Zuko person? Are they important?"
You know it's odd. He'd known this scar-faced person was in Luceti. He knew Katara had a (traitorous) comrade named Zuko. He had never really connected the two. He'd also never known he was living here, and despite himself he finds that this is the most uncomfortable thing to him. There's a very tense moment here... in which he decides if he wants to follow Katara's lead, follow Zuko's command, or screw both of those and pick a fight he has no idea if he'd survive or not. Wasn't Zuko one of those flame-people?]
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Katara admonishes him. And in doing that, he flashes back to a long, long time ago.
"What about that Zuko person? Are they important?"
You know it's odd. He'd known this scar-faced person was in Luceti. He knew Katara had a (traitorous) comrade named Zuko. He had never really connected the two. He'd also never known he was living here, and despite himself he finds that this is the most uncomfortable thing to him. There's a very tense moment here... in which he decides if he wants to follow Katara's lead, follow Zuko's command, or screw both of those and pick a fight he has no idea if he'd survive or not. Wasn't Zuko one of those flame-people?]