My theory is that professor L killed the student. It fits common folklore, especially common folklore in colleges. The dead fearing the thing that killed them but also watching them. The killer getting little hints at retribution coming, but not really believing it to be true. The student could have stuck to the professor because of that. Why follow you when the professor is the one that killed them? But the watching you… maybe it was a warning. Maybe it was trying to scare you away. Too bad we didn’t catch the gender. If it was female, what with the professors… attitude…. Towards women, then…

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Think about it Ashley.