If killing was the motive of that killer he would have killed and gone. Why is he or they have to bother about dragging the body to the stairs, cover it up with cooler cover, lock the stair case again and go. If an outside killer enters a house he will be having the fear too, he will rush out once his work is done. He will first lock the occupants of the room first. Easy access into Arushi's room suggest, the killer was not a stranger at all. First of all teens will not keep their room open. They will latch it from inside - that is a typical teen behaviour. If it was open, she would have been drugged and was not aware of what was happening to her. Killing a person when he is awake generates a lot of struggle and the victim will try to escape by running all over. If it was an outside killer the injury will be random and not a definite pattern. If there is some truth in their jugular vein being cut, it suggests in all probability this killer is a doctor and that too a dentist. That is one vein that is very important for dentists. There are records of most brutal murders committed by highly educated people. Level of education of an individual does not suggest he is not capable of brutality. Most of the dowry related killings are committed by highly educated individuals.
