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The ice in her gaze.
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Official Executions are irregular in the firenation. Unofficial executions, however, are a different matter entirely. Official executions require a lot of paper work and effort, and every execution has to be signed off publically by the firelord, after the accused has had a chance to plead their case. Father normally assigns someone to deal with it (deal with it being his favourite euphemism for all manner of sins).
This woman is different. The entire court has been enthralled and appalled by the rumour that she can bend blood, control someone from the inside. Father had to do something publically to make a show of strength, especially in the aftermath of the eclipse.
They walk the woman in and she is not what Azula expected. She is not a fierce warrior, but an old hobbled woman. She could have been handsome once, but now her face is just a ruin. She still has blazing blue eyes. They burn with what is either genius or madness. Azula cannot stop staring at this haggard wreck. She is horrifying and she is fascinating. She does not plead for her life, instead she curses them all at the top of her lungs.
Azula gets up to leave, because the woman unnerves her (though Azula will never admit this in a million years). The terrible eyes follow Azula. She can almost feel the piercing gaze on the back of her neck. Those eyes are accusing, as if what has happened to her is somehow Azula's fault , when the woman is a criminal for goodness sake.
Out in the gardens, Azula still feels that icy gaze. The feeling of unease the woman inspires in her remains.
It's like Azula will never be able to shake her off.