Mai would be lying if she said she's not bored of it.
It had been fun for a long time. Back when they were little kids, people had been scared of Azula because she'd known how to leverage being daddy's little girl. It had felt like a lot of power at the time, and Azula had let Mai and Ty Lee bask in the edges of it.
By the time just being Ozai's daughter's friend had started getting stale, Azula had figured out how to make the grown-ups scared of her because she was Azula. She was a pyrokinetic prodigy, and that had definitely been how she'd gotten everyone's attention, but Mai knew that what made people fear her was the way she used words like lesser humans used knives to the throat. It wasn't something Mai would ever be able to replicate, but she could still learn from it.
By the time just being Azula's friend was getting old, Mai had learned how to use knives the way Azula used words, and people were fearing her on her own merits too.
But now it's boring, for real, and there are no new thrills in sight. (Unless Azula decides she wants to stage a coup, which is something Mai carefully doesn't think about.) After all, there are only so many ways you can burn a building down.
From the way Azula grins as the flames start to peek through the windows of the one they've just set on fire, she's only enjoying it more after all this time, and Ty Lee will never get bored of anything as long as she has her two bestest friends in the universe! around. Mai takes one last look at the white smoke that's starting to pool out of the ground floor windows, sighs dramatically, and turns her back to it, sitting on the railing that Ty Lee's practically climbing for a better view and that Azula's resting her arms on like a dignified little princess surveying her kingdom.
"What's wrong?" Ty Lee asks as Mai pulls out a knife and starts cleaning her fingernails.
"Seen one, seen 'em all," she grunts. Azula makes a little hmph but seems too distracted to launch into a rant about all the incredibly fascinating nuances of arson. It's almost disappointing.
"Your aura's pretty dull," Ty Lee presses.
Mai can feel her staring. "Isn't it always?"
"Girls," Azula hisses, putting them both on alert.
There's a sharp crack from the building behind her. Mai would think it were something giving way under the heat if it weren't accompanied by a rush of arctic-cold air.
She whirls around to see a thick layer of frost forming on the brick. Azula and Ty Lee are already over the railing, Azula into the ground floor and Ty Lee flipping into a second-story window. Mai heads up, to get a better eye on the exits.
It's like the ice is sucking the life right out of the fire. No, not just the ice- from her new vantage point, what she thought was smoke curling along the ground looks more like mist.
There's a smothered burst of blue flames inside on the second floor, noises of rage and concern from Azula and Ty Lee respectively, and then a thick cloud of fog spills out the window, coalescing into the pale, ghostly figure of a girl about their age, colorless except for the bright, sharp blocks of red on her mask. Mai gets her in the right shoulder with a throwing knife, and she staggers in the air, whirling around madly.
She spots Mai and surges forward. The next knife, and the third, go through nothing but mist, and before she can get a fourth in the air the girl pulls her left arm up in a sharp gesture that traps Mai up to her neck in a block of ice.
Then there's no girl, just an iced-over warehouse, rapidly approaching sirens, and a swirl of mist disappearing in the wind.
Mai would be lying if she said she's not looking forward to things getting interesting around here.