Disclaimer: Avatar the Last Airbender copyright Dante Dimartino, Brian Konietzko and Nickelodeon Studios.
Traveling with the Avatar, she'd had several supernatural encounters. While some were malevolent like Koh, many spirits were benign. Perhaps that's why La's transformation still terrified her years later.
Katara could still see La's fury staring back at her through Aang's eyes as she possessed him, warping the Avatar State into a horrific force of revenge. By the end of her grief-fueled rampage, a fleet of Fire Nation ships lay at the bottom of the ocean.
In minutes, thousands of lives were lost.
She understood then that spirits could be deadly. Katara knew it'd be enough to convince Kuei too.
