Find the Avatar, that's the one mission that Zuko has built his entire life on -- mainly because his father exiled him until he does so. So that's exactly what he's going to do, and no one is going to stop him. Not even you, some kid from a water tribe. All he knows is that Avatar is here, on Kyoshi Island, and you're hiding him.

"You. You're not stopping me again."

The prince growls, his hands steaming as he prepares an attack. Either you fight, or surrender and hand over the Avatar.