I explained that to you, Dan. When the camera is about to roll or is rolling, talent blocks out the extraneous and focuses on the interview. The big black guy could walk up stark naked and they wouldn't notice. They are busy getting the interview. They're focused. Hyper focused. Camera lighting also reduces the eyes accommodation and thus visual cues.
It was 6:46 am, no one else is around and a big black guy walks up to your 'interview'... they probably felt the walkway shaking from this guy walking up... there was literally no one else around... the guy raises a gun practically in your face...
the camera wasn't rolling... that's why the 'shooter' lowered the gun and waited for the cameraman to start shooting... , you look at him but you don't 'notice'... he's standing close enough to touch the camera man but you don't 'notice'?
That's B.S.