Well, that makes it sound like those are opposites, doesn't it?
What you need to understand is that ayakashi live much, much longer than humans, and they don't really distinguish between individual humans very well. To them, the Natori living today might as well be the same Natori from hundreds of years ago who exorcised or sealed their brethren. There's some degree of protection in not being able to engage with them, but not total. So imagine you're an ayakashi out to get revenge on a family that wronged you, and all of a sudden one of them can look back.
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What you need to understand is that ayakashi live much, much longer than humans, and they don't really distinguish between individual humans very well. To them, the Natori living today might as well be the same Natori from hundreds of years ago who exorcised or sealed their brethren. There's some degree of protection in not being able to engage with them, but not total. So imagine you're an ayakashi out to get revenge on a family that wronged you, and all of a sudden one of them can look back.