Coming at roughly the same place in the season, “Shiizakana” and its killer who springs from the shadows seems to directly echo season one’s “Buffet Froid,” which introduced us to Georgia Madchen, another murderer with an identity disorder. And in both cases (as in most cases this series show us), the killer mirrored one of the characters and one of the larger themes. Georgia Madchen was afflicted with Cotard’s Syndrome, believing she was actually dead and rendered incapable of identifying other individuals, even as Will’s own capability to trust his faculties broke down, leaving him grappling with how much of his perceived reality he could trust, and whether anyone was who he thought they were. In “Shiizakana,” Randall Tier believes himself to be an animal born in the body of a man, but he isn’t, not really. As Peter Bernadorne tells Will, “Man is the only creature that kills to kill.” That’s what Randall is doing, even if he justifies it by claiming there’s a beast inside him he cannot quell. There is a beast. But that isn’t the animal inside Randall. It’s the man.