A disgruntled former employee has been spotted on the premises of his former place of employment — armed with a hand gun and loading a rifle from the back of his car. A call comes into police dispatchers, who relay these few details to officers on patrol. Multiple agencies respond simultaneously, with only seconds to assess a fast moving, potentially deadly situation and take whatever action is needed to neutralize the threat and save lives. This scenario, which was played out at the five-story former headquarters of the Orange County Register building in Santa Ana, wasn’t real, and instead was the…