this wasn't a suicide mission. he obviously wanted to live. >> and that's an interesting point. i want to ask you, chris, about that, because often in these shootings, they are really suicide murders, right, because often times it appears the plan of the shooter is to die by cop. you'll hear sometimes here's a case he tried to get away. and he's captured alive. how unusual is that with shootings like this? >> well, i mean, we've had 25 school shootings since columbine. and most of those instances shooter ended up dead either by the hands of the police or their own hand. so the best that a school can do is take certain measures. there are certain things you have to have. you have to have a triage system, early warning system, a team that assesses threats and acts on them if there is a threat out there. every school should have a lockdown system and drill it well and they should have magnetic locks on exterior doors so there is an instant lockdown