What I glean from this is that K and M were sleeping on the second floor? Please explain because I am curiousCould be and reasonable people can certainly disagree, but my initial impression is that I don't think his tone reflected that. Almost seemed disgusted that the killer went upstairs at all (e.g. "he didn't have to go upstairs in order to get his targets"). *Words in italics are my own and for emphasis only.
My opinion.