 I know you just heard them yell, he's got a gun, he's got a gun. You heard a shot, then you hear the counterfire from the Secret Service snipers. Lots of questions about what's going on here. We're going to talk about that with a former Secret Service agent at the bottom of the hour. But right now, in those crucial moments where this happened, there were some eyewitnesses there. One of them joins us now. Before I do that, I want to just set the stage with a little bit of the sound of what happened