Azula is in fine form, as she uses the temporary flexibility from being chi-blocked to slip an arm out of her straightjacket and escape Zuko long enough to burn Ursa's letters, forcing him to free her to accompany him on the search to have any hope of finding her.
And fending off an angry wolf spirit and its army of moths in seconds.
Speaking of Azula it's amazing how her bending has actually improved despite the time she's spent in a straitjacket in the institution. Specifically how much control she has over her lightning.
The wolf spirit itself. It's as powerful as the benders, and it can fight well against Appa. When it's in a corner, it spits out moth wasps, rendering Sokka's arm useless and causing Katara to cough for the rest of the fight.
And let's not forget Appa, who bravely fights this wolf.
Sokka finally gets to use his boomerang against Azula, with the same trick he used against Zuko in the pilot, no less.
A bit for Noriko, who despite not knowing what's even going on, apologizes to Azula, and then doesn't hesitate to accept the Mother of Faces offer to return her memories, even knowing they would be bad, for her children.