Wait what? Hae Bai was able to affect the Avatar world... he could kidnap villagers and destroy houses. He is a spirit but is able to touch and affect the Avatar world and the humans of the Avatar world are able to see him which why the villagers had asked the Avatar for help in the first place. With Koh, all he needs to steal a face is for a person to show an emotion. So he probably traveled to Avatar world and him being a somewhat creepy looking spirit, it is easy for any avatar human to have an emotion on their face when they see such a creature as Koh. So he probably bumped into the Avatar's girl and maybe she just freaked out and so Koh stole her face. And it all happened while Koh was in the Avatar world.
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