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Well you could say that his blood is not pure, therefore the mixed blood doesn't work
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Well you could say that his blood is not pure, therefore the mixed blood doesn't work
So, I think Yohan's blood kills them if they have just months left because he isn't actually a pureblood. He's not the real thing, he's basically a copy, so because of that his blood doesn't work the same way Hayan's or her parents' work. Because they were born that way, their blood would obviously be stronger.