User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-77.245.245.202-20141120201235/@comment-24468758-20141122071046

So maybe Rias and Akeno get an immunity to it as both of them took in a dragon's power and that power even influenced their own powers. If that would be the case I would feel releaved as at least these two wouldn't be affected anymore.