I think it more likely that Jack planned the attack on Mary as opposed to it being a spur of the moment decision. Since it was a change of M.O., he would need to know the likelihood of her being visited in her room, some idea of her neighbors and a strategy for fleeing should he feel threatened. My guess is that he had met her earlier (maybe in a pub) and had gotten a sense of the situtation. If he had spent some money on her it might have made her more willing to open the door to him that night.
c.d.
c.d.
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