I think Mark Jefferson make a relationship with her victims before he drugged them and put them un the dark room because it's almous a fact that Jefferson was dating with Rachel for the conversation between max and Jefferson in the dark room. An other victim was Kate because un the episode 3 of LIS before Kate tried to kill herself, she was talking to Jefferson but not like a student, she was talking to him like a friend or more. An the last one was victoria because she were flirting to him in all the story and Jefferson tried to hold on until the party of the Vortex club.
Pls answer me to know what you think about this.😃