Hello everyone, I hope you don't mind yet another new member chime in with their theories. So to be clear this is entirely IMO or MOO!
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Lastly, as someone who recently graduated from university I have heard several stories of friends waking up to find a homeless/transient passed out on their couch or front porch. They simply just stumbled into their house for a place to sleep out of the cold because the front door was unlocked. And not to stereotype but I could imagine an older homeless man carrying that type of knife on him for various reasons (food, self protection, etc.). So I guess that's the theory I'm going with. An older, likely mentally-ill, transient who was drunk or on drugs found his way into the house. Maybe Ethan awoke and confronted him and he pulled a knife out and went crazy. College towns seem to unfortunately be popular among that type of person. I lost count of the number of homeless people I would see sleeping in the library or harassing people for money around campus.