Alright, guys. I think I figured out what happened in the end. While you're rust, you walk down the corridor, demons attack you. Both the elevator and the corridor obviously represent time going by, as the disease was getting worse. I'm sure by now we all know this. But, here's the catch. When you get to your most injured stage, you can see little horns poking out of her head, and teeth coming out of her face. Like a kaibutsu. The female kaibutsu, in fact. So my theory is, Sabitsuki's condition got worse and worse over time and wanted to pull a madotsuki over the railing, but the maid(nurse?) stopped her for a reason. This reason is? Well, Sabi does try to attack the maid, so you can tell she was already out of her mind. And also, the maid cut off her legs. Her legs. Think of the machine effect. What if, perhaps, whenever a rust patient starts to go kaibutsu, the maids install whatever the machine effect is? What if the Kaibutsu were just poor victims of the rust disease, but became terminally ill before the machine method was invented? What if whoever invented the machine effect…was Oreko?
Also I promote the idea that the first patient to ever receive the treatment was that monochrome girl, but Sabi had seen her and her house on a black and white newspaper?
Yeah, I think I agree with you for the legs thing. I posted a theory sometime earlier that said basically the same thing about the implied suicidal intent and infection
My interpretation was that sabi had become trapped in .flow and it wanted to keep her alive to advance the infection. Your guess is as good as mine really
I like it. o_o Though I think I'd be more accepting of this theory if the Kaibutsu were wearing something like a hospital gown, or even just casual clothes like Sabi. But with the way they all wear school uniforms, including the one that resembles Sabitsuki, I think they're supposed to have some connection to the school. I'd assumed they were some kind of horrific representation of preppy kids who might have bullied her at school, but their hair does seem to connect to the idea of her disease as well.