What X-ray said. Had a similar case here in AZ a few years ago. AZ DPS officer shot and killed a suspect who ended up facing away from the trooper in the process. Good shoot and cleared. I'll try to look up the case. The other issue is, one can be maneuvering out of the line of fire and end up with the suspects back facing you. If the BG is still actively engaging you even if your facing his rear, well then good shoot.