The hunting of humans has fascinated people over the years...he is caught up in PLAYING G-d and "seeing all"...his ritual leading up to the shooting is what he get's off to...and the climax is the "taunting" the police and what he perceives as being smarter that the police and "getting away with it"...the climax to his actions isn't the bullet killing the person ONLY hitting it...the calling card in these attacks is that the "bullet" which is his calling card...some serial killers take souvenirs (ears, nipples, jewelry, pieces of clothes, shoes etc.) , leave notes, engrave "marks" on the victims, use a particular method to kill...rope, hammers, etc.
He is a plain and simple serial killer and his actions are totally predictable EXCEPT his next "targeted location"...history has shown us up to this date he seems to like Gas Stations near major intersections with immediate access to a highway...he also likes shopping center parking lots too...and has ONE school under his belt. Patterns - patterns - patterns are the key...symbolism and patterns are part of the ritual...he wants to see IF the police can tie it all together.