tried to raise the gun, i fired two more rounds and killed him. >> i can still see it's hard for you to say that. >> yeah, nobody wants to do that. i thought he was firing rounds at my partner. the whole situation as it unfolds, it's so fluid that you're just a reactant to what you're seeing in front of you. >> as i understand when it happens many times it's like tunnel vision. you don't really know what's happening many of the times and you sort of -- if you're in a corridor, the corridor seeps longer than it is. time speeds up or slows down depending what happened. explain what it means to be in a situation like that. you were involved in three shootings in the 22 years you served. >> you revert back to your training. one thing we were talking about earlier, it's more of a conscious thought not to shoot than it is to shoot because you react to what you're seeing and revert to your training and engage. and you're in fear of your life