I have a theory (speculation of course).
As an anxious person who gets frequent UberEats (more than I should, probably), if I pick up an order and ~10 minutes later see my front door open, I’m assuming my driver’s come inside. This may be paranoid, but in XK’s mind the last person she saw at that door was her driver. Perhaps she thinks it’s a robbery or something’s gone wrong. Either way I think she has an “off” feeling about it.
Assuming she doesn’t know DM is awake - who is she directing “someone’s here” at? In my opinion, EC. And I think she’s speaking to EC loudly, because she’s concerned. This would absolutely be my first call if I was worried about an intruder, even a seemingly harmless one. Immediately wake my boyfriend up. If EC was indeed asleep, I think she says this loudly and worriedly.
I live with 4 other people, each young people with their own rooms, and I wouldn’t feel any less scared if I thought someone had broken into my home - especially if I was the only one awake. IMO, she calls EC out of panic. Maybe not full-blown panic, but she’s certainly confused.
THIS, IMO, is what makes BK hurry downstairs - not only is someone talking, she’s talking loud enough for him to hear her. This leads me to the “crying in bathroom” testimony from DM - are we 100% sure XK isn’t found in the bathroom? From what I remember (forgive me if I’m wrong, it’s 4.00am in UK right now), the PCA states he sees XK “as he approaches the room.” Does this go further to state she’s IN the room?
I just think that if XK was indeed found in the bathroom, this would explain the details on the 911 call, like not being able to get the door open despite SG saying their BEDROOM doors were open.
Again, it’s super late, correct me if I’m wrong on any of these details. Thought it was really interesting that DM heard crying from the bathroom, specifically.
All JMO.