..........With that description of "Barney's killing" how could anyone not conclude Dimitri is a serial killer!! He must have a clear plan of attack in mind and not be insane. there are two types of serial killers, organized and disorganized. The deputies killing was organized, the 1st raid was disorganized and it is rare for serial killers to work with others in their "quest". Although Dimitri may have some respect for the Scar, I think he is more likely compelled to finish his mission for his own ego.