As a side note, I’ve also learned what is the significance of the term "half-blood" here, and why it is a slur. It does not mean the same thing here that it does in Britain. Here, it means "part-human"—and, my dear, before you object in righteous indignation on behalf of your friends Fleur and Hagrid, it means a very specific sort of part-human here. The sort, I need not explain, that infested Innsmouth. It turns out that the Arkhamites have very good reason to distrust part-humans.