[deks]

re: There is a photo of the shooter taken from above his shoulder when he was on the rooftop.

I've seen the unidentified photo that resembles Thomas Crooks. But it doesn't look like a rooftop to me.

The question then remains: Where and how was the photo taken and when?

[butterdezillion]

It looks like he’s sitting on top of something that gives him a view of the grass below.

It would be good to know the details of who took that photo and where/how.

Ya know, the reports are saying that somebody in the building took a photo of him, IIRC. Maybe this is the photo that they took of him, outside the building.