RE: How far back?
Traffic cop has his white gloved hand on door, earlier CNN source of same scene confirms it, tells me something but not sure if it helps.
Also that cop ushering in people in the Hughes clip, shows the shadow changing on him without him moving his feet.
Standing on very edge of landing and leaning head forward alone could have kept Lovelady or Shelley, free of lintel's shadow, again look how it moves on the cop as he leans.
Saying that I still have an easier time seeing BL on step.
Alan, can you see the man's head perhaps dip into the shadow? That area of his head wouldn't be that far from BL's darkside IMHO.
Closest thing I've seen to evidence of shadow there to date.