悪い子になったら 鬼が出るよ

the first assumption one would probably make is to connect it to her having broken a cult rule, leading to Amane murdering her. which yeah could still be that. but I started thinking about alternative explanations as to how her mother could have not "kept her faith to the very end". because I just like to brainstorm about every single possibility for things no matter how plausible they are to see if there's anything there.

and so I was trying to think. how could that altercation have played out? do you think Amane incapacitated her (but still conscious) and tried to question her before actually doing anything? what if she did? what would her mother have said to try to explain why she killed the cat? I can't see why Amane's mother wouldn't be able to defend her decision. obviously it wouldn't really matter in the end if she could or not, because that's not really why Amane killed her.

so what her mother would say doesn't matter. just what if she did say something. Amane doesn't listen however. she doesn't care. it doesn't matter. her mom needs to die. her mother realizes that "logic" is not going to get her out of this.

Amane's answer is basically one of the cult's doctrines, isn't it? "’Tis ordained, thou shall stay thine course, then perish". the "then perish" bit can make it a little misleading, but what it's literally saying is to just stay on your course (continue acting for the faith and continue believing, basically) until you die. or in other words, until the very end. Amane's mother seems to have broken this doctrine based on her answer.

and so that obviously got me thinking about how her mother could have broken this doctrine. I mean, she was literally torturing her daughter for this cult. she's as dedicated as it gets (whether that dedication is genuine or out of survival is another question... but that's not important for this). but when you're scared and emotional enough, you can do some pretty out of character things. fear of dying I think would do the trick lol.

then I started thinking about some lyrics to a song I really like, "Hey, ain't it funny, you can't bear the same sort of agony you forced me to emulate?". the song is about a child getting revenge on their abuser(s), just to give relevant context. so you can see why it came to mind.

Amane (most likely) tased her mom to incapacitate her. her mom tased her as her first punishment for helping the cat upon getting home. she was using the same tactics used on her but for punishing and killing her mother.

I think it would have REALLY pissed Amane off and just fueled her determination to hear her mom attempting to plead for her life and to apologize to get Amane to stop. this sounds a lot like some lyrics from Purge March...

After you cry, repent, and kneel, it’s now your turn to say that hopeless “I’m sorry”

maybe Amane was describing her mom's actions during the murder with this...? her mom was trying to plead for her life. maybe she went even as far as bargaining with Amane, saying she'd treat her better and not punish her again. but punishment is part of what you must do as a believer!!! you must punish the wrongdoers! to say you wouldn't would be simply going against the cult. maybe this is how she broke that doctrine? she went back on the word of the cult to try to save her own life. she did not keep her faith to the very end.