[Zuko isn't good enough at reading people to know if he's telling the truth or just trying to cover his tracks, but between him and Zahi she's not convinced something else isn't going on here. She can't just chalk it up to "kids misunderstanding things." On the other hand, she doesn't know how to catch either of them in a lie just from talking to them.
no subject
If only Toph were still here.]
It's wishful thinking is what it is.