it was just a red herring. i don't think paddock -- i think he had a lot more time that he had been planning to set up this massacre and that interruption, i agree, saved hundreds, possibly thousands of lives. he had to start shooting because he had been found out. he didn't have as much preparation time as he thought. >> he didn't expect anyone to be on to him that early. here's what the clark county sheriff said to investigators what they have learned about the shooter at this point. watch this. >> currently we do not believe there is one particular event in the suspect's life for us to key on. we believe he decided to take the lives he did and he had a very purposeful plan that he carried out. >> so no sign of any precipitating events, but this man took the lives of 58 people, injured hundreds more. what personality type does this kind of behavior fit? this is for you, casey. >> well, in criminology we saw this a pseudo commando, but it's not that easy. it didn't happen overnight.