The relationship between the detective and Mamiya feels so fascinating in this film, I love how we are shown both of their stories as they come together to meet as if it's fate for them to find each other. The detective's undying curiosity and obsession with Mamiya ends up to his own death (I believe?) in the end because he sees a part of himself within the killer. It would have been easy for him to simply leave Mamiya within the mental hospital but instead he chooses to confront him because he is deeply disturbed by Mamiya's mysterious power over him. The whole idea of hypnosis and mind control feels like it plays into this as well, as while I was watching I simply felt like everything was falling into Mamiya's web. Ultimately he is the one in control and even with his own death he still ends up winning over the detective in the end.
