This is a great post. The scenario you first described would prompt me to act. If I got down and was not the first person to be shot I would draw and engage because at that point I have to assume I am next. I am in grave danger. My life is one the line at that point so acting gives me the best chance of surviving. At that point for me if I don't act I am simply waiting for my turn to die. It is time to deploy the weapon of last resort. It may or may not increase my actual chances of surviving but at that point I believe I would act. At the same time I understand that some people do not have the ability or will to fight. I do not think less of them or thing better of myself because I "think" I would act in that scenario. In the second run I think that there are reasons why people reacted as they did. I think the fact you knew it was coming and that it was a simulation greatly effected the way you and the other 2 guys who chose to fight. Many people are not "fighters" it is not in their DNA. They do not believe they have the skill or the will to fight. It does not make them weak or lessor human beings it is simply the way they are. Also you made an assumption that the exact same things would happen and that prompted you to attack. There is just as much of a chance that the scenario would go down differently. Everytime there is a robbery with a gun where people are instructed to "get on the ground" it does not end with the execution of all in the room. I don't know for sure but I would imagine the majority of the time when those words are uttered no one is shot. People get robbed but not executed. It is not unreasonable to believe the second run would end differently in the real world. It is human instinct to hesitate when confronted even when you knew it was a simulation. Honestly there is always safety in numbers and the more people confronting and attacking the attacker will up the chances of success for the group. However, I would contend that this will not always be the case. In an active shooter situation multiple people drawing guns and engaging a shooter + LEO arriving on scene can result in more deaths including those good samaritans who choose to engage. More unidentified people with guns could cause confusion and result in more harm. In the end every situation will be different. Everyone must choose for themselves if, when and how to engage or not engage. I take issue with the mentality that I would always engage just as much as I take issue with the I will never engage mentality. I really take issue when people portray themselves as some sort of hero for taking on the engage mindset. Casting a negative light on those who would get the **** out of dodge. Hopefully none of us will ever have to make that choice but I am willing to bet no one can predict 100% how they will react to these real life and death situations.