That photo gave me chills.
BK, walking, in profile.
Just as DM probably saw him. Male, typical male height/range, and that brow. Whether it's bushy eyebrows and highbrow or highbrow alone, it's prominent. No wonder if stood out to her.
Perhaps a zoom lens, and whether intentional on his part or not, it's equally chilling that he didn't turn his head. If there is such a thing, I wonder if BK doesn't have actual tunnel vision. I do not find his head movements natural. Off. Mechanical. Robotic. Surely I'm imagining this part: it's almost as if where one might hear a noise and quickly turn toward it, BK continues to listen to the sound, evaluate it and bring his eyes around to it, a halfbeat, fullbeat or three beat later. I'm basing it on his behavior at the defense table and little else... but it would gel with his exit from 1122. He didn't SEE DM, processed her presence, but by the time it registered (if he did look back), the door was shut, the house was quiet. He sped away from the crime scene. That suggests to me he was spooked. Or rather, had reason to believe 911 was in play. I don't think BK registers fear; in fact, where mist people would experience fear, I think he feels something like a thrill, maybe even his only real feeling in a sea of general numbness otherwise. In any event, I think he realized he left a witness behind and made the executive decision not to go back in but to get away and fast. The convoluted route -- a dodge and roll maneuver to avoid being tailed.
I still maintain that he only had one individual targeted, and to that, I maintain that having that crime scene discovered (the one murder) was part of whatever it was he commissioned himself to carry out. Not at all unlike the arsonist who stands back and watches the fire...
JMO