I went through the Active Shooter/Killer/Terrorist program this weekend at Tactical Defense Institute near West Union, Ohio. Great stuff, which I highly recommend to anyone. In addition to many live fire exercises, there were a host of active shooter, shoot/don't shoot scenarios ran through. Each student ran different portrayals, one of which I'll recount here. In a parking lot full of people, a gunman appeared and began firing on people. I took cover, fired on him and he went down. As I checked for another shooter, within a few seconds, I heard shouting at my 4:00. The auditory tunnel effect was in full effect and I couldn't process it, so I turned to see a gun and what appeared to be a badge in front of an individual in civilian attire, aimed at me about ten yards away. My hearing refocused, and I heard him shouting for me to drop my weapon and get down on the ground. Now what? Two of us ran this scenario as the good guy with the gun, with considerably different reactions.