Battery Pro Manager Held up by Two Robbers, Kills Armed Gunman, 2nd Gunman Flees

Manager of a Battery distribution business kills one of two armed gunmen who entered his store to steal cash. There are many stories of managers who are robbed and then shot and left to die. Why should an honest hard working businessman be forced to rely on the mercy of heartless criminals with no regard for human life? This man didn’t trust to their mercy but protected himself by exercising his second amendment rights. What would you do?