Iroh steps smoothly in front of her, stopping her from attacking the guards.

Rrrgh.

"Why don't we negotiate instead?" she says, not at all pleasantly.

"I see no reason to."

"You have no honor, Zhao."

He sneers at her. "Is that a challenge, Princess?"

"Yes."

"An Agni Kai, then."

"Fine."

She can have a breakdown later. Mustn't show weakness.

Fortunately, the base has a nearby courtyard perfectly suitable for this - as well as suitable ceremonial shawls, since they're doing this properly. 

She's glad they don't have to wait until dawn. No time to second-guess herself.

Zhao's combat style doesn't give her much time to second guess herself during the duel itself, either - he's extremely aggressive, trying to throw her off balance with wide sweeping kicks and harsh punches of fire. 

...Is he telegraphing on purpose? He's just so much slower than Aunt.

She focuses on dodging, neglecting to take advantage of the openings she sees in case it's a trap.

It's entirely probable he's actually just this much slower than her aunt, especially as he grows enraged with how she's avoiding him - which makes him sloppy. 

She kind of thought Fire Nation commanders were supposed to be good at firebending. But okay. Next time he pivots back for a high kick, she sweeps low herself to blast his ground leg out from under him.

He falls! And tries to roll back to his feet. 

Too late, she's already kneeling on his chest, fist wreathed in flame.

"Yield."

He sneers at her! "Kill me, you coward," he challenges. 

"That was not the terms," she says. "Yield."

He tries to hit her with a blast of fire from his feet. 

She twists out of the way and drives her palm of fire into his chest.

He curses, tries to block - but she hits him, scoring the light burn that's technically all that's needed for a standard Agni Kai.

She backs off, taking a ready position.

Her Aunt steps forward to examine the scene. "It seems the match has concluded in my niece's favor."

She's not relaxing until Zhao actually concedes.