Hypothetical:
Say an officer attempts to lawfully use his Taser during an arrest, and a suspect takes it, and uses it against him. Say the officer still has barbs in his flesh, and the suspect runs a short distance. While running, the suspect is obviously facing away from him. Let's say the officer believes, or has reason to believe, that the suspect still has the Taser, and the ability to use it against him by simply energizing the wires again. (I don't know whether Tasers work that way. It is my current understanding that they do.) As the suspect, if he has the Taser, does not need to turn around to do this, would the officer be justified in shooting the suspect in the back? He has reason to believe that the suspect may tase him, and then cause him further injury or death.