Yes you are right on that point. After the initial contact, did the officer pursue on foot? During said pursuit, did suspect turn and advance on officer? If suspect turned and rushed officer, did officer draw and fire while retreating to put distance between suspect and him( I would be)?
Now just looking at casings on ground you tell me how you now which way suspect was moving and officer was moving in a linear fight buy just shell casings. How do you reconcile the casings on to position without corroborated evidence other than casings alone.
Just a wild guess, but the officer involved statement as well as the witnesses will easily establish that, as they've already established the struggle initiated at the vehicle and moved away from the vehicle until the final head shot.
My point to you was clearly the casing locations will depict where the officer was when he fired.
wow...