The more we dig the more I’m convinced Crooks fired all 8 rounds.
I think he has the receiver of the rifle almost on the peak of the roof. There are 40 ridges along the west side of the building from edge to peak. I circled the exposed tree in the distance for future reference and the light beyond Crooks looks to be to his left, but in actuality is almost in line with his head down the center of the roof peak.
The light is dead center on the roof peak.
The zoomed-in image of Crooks shows the same exposed tree with 17 of the west side ridges to the right of him and 23 to the left. I think this puts him right to the roof peak.
This is his position on the roof.
If you watch the casing ejecting from the @kwaka video this is how the first three casings end up on the south side of the buildings peak.
Crooks then sets up or rises to his knees and fires the five quick shots which puts those five casings on the north side of the roof peak. It also exposes him to the ground sniper who hits him in the right hand or arm (and possibly the gun stock as we’ve been told). This is why his right arm and hand are bloody.
This confuses Crooks, hurts him, disorients him, or he realizes this isn’t part of the plan, and he turns to the west and takes the final shot to the head.