I didn't see the knife.Last week, the Douglas County Sheriff's Office unveiled its video shooting simulation system, consisting of scenarios rear-projected onto three screens with real time sound and effects.The training system will allow officers to practice their craft using real weapons, but without live ammunition.My scenario involved an angry husband and a woman who was in fear for her life.On my first try, she yells that he's coming. I see him coming around the corner of a building and then racing across the yard to where she is. He knocks her down and his hand goes up.Instructor Mark Munoz …