(for those who have not yet read city of glass, spoiler alert. =])Does anyone know what the demon who captured Aline did to her? And why she ran away after that?

From what I read it didn't really give that much detail. I think Isabelle thought the demon was trying to rape Aline. Then Isabelle came along and attacked it. When Aline woke up, I guess she ran away because she was confused and scared.

Hope I helped:)

well alines sando was ripped open and the demon cut her across her chest. It was saving her for later but Isabelle killed and aline fled in fear.