walked in. again, we did the same research. this was a guy whose biggest crime, at least in the past ten years that we could find, what the traffic ticket. videos of the massacre in las vegas have now flooded social media, first-hand views of the chaos of the scene and the panic felt by the tens of thousands of people under fire. but what we could not see was the chaos after the shooting, as hundreds of people flooded into emergency rooms across las vegas and thousands of doctors and nurses fought to save these victims lives. for now, we would like to bring in alice benjamin, an e.r. nurse specialist draining me from new york. i know that this is old hat do you come a brand-new for a lot of us. when you see some type of a mass casualty situation like this, there has got to be a priority list, what is the first thing that you are doing? the first thing you are looking for? >> with all the training i have,