He stops, thinks for a moment. "I have to face him sometime." He finally says. For all that Aang is powerful, he's still smart. That means that Zuko can, hopefully, reason with him. His people would never accept a second nonbender as Queen. (To be honest, they hadn't accepted his mother as queen either.)

"Would you go tell Uncle?" He wants to spare Aang's feelings as much as possible. And making him deal with Katara and Zuko as a united front is just unfair. "He's probably playing PaiSho with one of the other Masters."

He squeezes her hand, and will turn to go look for the Avatar.