[...and finds that she is still annoyed, but not to the point of wanting to hit him anymore.]

It's just a stupid experiment.

[Carefully, Katara turns around on her seated position, pointedly keeping her skirts close to her legs as she does so, in order to turn and dip both feet in the fountain. The water soaks her skirts, her blood-stained slippers, and her wound. She'll be able to disinfect it and bend the blood and water out all without removing the shoe this way.]

Just go finish your story. You'll feel better when it's done. Try not to let your 'shoe' bite anyone else.