The fire burned blue in the building Azula had targeted. For no other reason than she could. Her lightning was still wildly unpredictable, in conjuction with her emotion and fractured mind. She had lost so much in those last few weeks, ever since the Boiling Rock Prison, ever since Mai and Ty Lee had betrayed her.
But in this city she was rebuilding. Now she was free of her brother and the other traitors to the Fire Nation. Even if the Avatar was here he was from before then. From when she had attacked him in Ba Sing Se. And he feared her.
With a huge blast of fire the building burned quicker and Azula rode the flames down across to the next roof and thats when she spotted him, being the hero and when she spotted the fear visible even in his stance. Azula was afer all, a people person.
"How many do you think that you can save? Just out of curiosity" she asked with the same chilling cruelty the Avatar would remember so well