Hey rich.

I only replying because i just noticed the exact same thing. I was going to adjust my window blinds... when someone turned their 180 degree at me. I wonder if its because their subconscious caught me at an earlier stage and its some instinctive protection to never turn your back to another human who could be a danger.

I was pretty sure he didn't see me so its kinda strange ... Maybe they can detect eye contact on them, cos i was 'looking' at him lol, like either before they turn away, or if after, then it clearly prooves some kind of strange effect. Cool observation!