all 4 of them ? impossible to cover 4 rooftops ? strange.
its literally the only other vantage point to cover if you are SS. the 2 buildings joining where they were are a non starter. so that only leaves the shooter building and the small building off to the right, small building to the right has a sloping roof vs the shooter roof which is the only flat roof in the entire area for a possible shot to happen.
either gross incompetence or something else. take your pick.