I doubt BK EVER talks about what other people want to talk about. Including at traffic stops.
He talks about what HE wants to talk about.
Thai food and PA's lack of crosswalks...
I am going to guess that his sisters were very aware he had never dated anyone while boasting about the hot Moscow girls... and parties he never attended or barely attended.
Girl mentions hiking. BK shows up where people are hiking. I think he's an opportunist, wherebry HE is not only taking advantage of opportunities, he's busy creating them.
Like his colleague, where he creeps her out by moving things around in her apartment (maybe not his first time there either, maybe just the first time he pushed it so far she noticed it), in order then to orchestrate a false sense of security which he could next exploit.
Something perverse and sadistic about that.
Maybe HE didn't sit in the chair but he forced XK to.
XK's music goes of at 4:12, the audio starts at 4:17.... it suggests that he was engaged with XK for five minutes, that is a loooooong forever when one side of the conversation has a Kbar.
Somehow he had her incapacitated, by force or injury, while he murdered EC. In that moment IMO XK had no world outside her room. And honestly, who could expect her to. I doubt she was able even to comprehend he may have murdered KG and MM, BF and DM. She would have been consumed with survival and trying to make since of what was happening in her room. Whimpers, crying, IMO involuntary utterances, she might not have been aware herself that she did or didn't make a sound.
I can't myself make much sense of the audio but could the thud have occurred outside, BK jumping from a retaining wall, for instance?
Could 'It's okay in here to help you' been what DM and the audio picked up, DM looks out, BK is leaving, jumps off a retaining wall, dog starts barking, all one sequence, occurring within seconds?
jmo