Disclaimer: Don't own, never will.
The first that Katara knew something was wrong was an agonising tug from deep inside her. She gasped in pain, pressing her hand against her chest and blinking back tears. Then there was another, sharper, tug and she let out a cry. The pain receded and she inhaled sharply. She rose unsteadily to her feet, staggering down the dusty corridors as the pain came and went, but always growing in intensity.
When she found Zuko, he was in the same state as her. They clung to each other desperately as the pain faded, both knowing that it would be back with a vengeance. It spiked one final time, and they screamed, arching away as something sparked between them.
When, after a few long moments of agonised breathing, Katara managed to lift her head, she found herself looking into Zuko's eyes. He spoke, his voice sounding odd and somewhat hoarse.
"What the fuck was that?"