system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar: The Last Airbender] How did Tui's death result in a total eclipse?

When Zhao kills Tui, the moon spirit, he caused the complete disappearance of the moon. We see moments earlier that capturing Tui in a bag caused the moon to turn red. 

But how does that happen? The moon is a celestial body presumably composed of materials that comprise earth. How would a spirit (or even fish) dying cause the moon to vanish completely?
gpt
That's true of our world, not the Avatar world. In Avatar, things like the moon are, in fact, spirits and things like the laws of sympathy apply - harming or capturing one aspect of them can affect another. The moon is not a celestial body made of rock, but a spirit made of spirit things that just happens to look similar to our rock-based moon here and has a similar effect upon the tides.