This took place right after the battle between Azula, Zuko and Katara.
Azula relized she couldn't get out of the chains, Katara tied her in, and stopped releasing fire. She didn't know what to do. She had lost. She then noticed she was crying. For the first time in she didn't know how long, she was crying.
Katara awkwardly turned her head away from Azula. Zuko, on the other hand, just looked at his sister confused. This was the first time that he saw her cry.
'Why am I crying?' Azula thought 'Is it because I lost? No...It's not only that! I am the princess of the Fire Nation and I was about to become the Fire lord! I was supposed to win, not Zuko and certainly not that water nation peasant! I worked hard and grew more powerful everyday and people feard me, as they should have. I worked hard to make father proud of me and to become a strong ruler and now Zuko who was banished and who was feared by no one, is going to take the fire lord title away from me? Could I have been wrong?'
As Azula continued to cry she looked down into a puddle of water and saw her reflection. She did not like what she saw. Her eyes were puffy and her hair was tangled in many places. It wasn't just her apearance that bothered her, it was how weak and vulnerable she looked. The sight of herself like this made her faint.
When Zuko saw her fall onto her side for some reason he was worried and ran to her.
Katara followed as she yelled, "Be careful Zuko!"
Zuko went down to his knees and as he was getting ready to check her pulse he saw her chest go up and down, as a sign that she was still breathing.
He sighed in relief and turned to Katara and said, "She just fainted."
Katara nodded as she said, "What should we do with her?"
"We'll decide later, for now I'll put her in her room." he answered as he untied her chains
"Are you sure it's safe just to leave her there?" she questioned
"Look at her, Katara, does it look like she has any fight left in her?" he asked staring at his sister.
Katara shock her head no.
"Okay then lets go. Aang and the others should be here soon with news of how his fight with my father went. Hopefully it's good news." Zuko said as he picked up Azula and carried her into the palace.