caught. i think you're looking at people who, when they have this kind, they engage in this kind of carnage, they feel that they are extremely powerful. they fool themselves into believing that they can get away with it and they then become very careless and so even though they didn't claim responsibility because perhaps just they just wanted to get away, this bragging was part of this omnipotence that they were feeling at that particular time, killing several people, maiming over 100 people, and all of that media attention behind them. so it gave them this false sense of power. >> definitely the investigators will be trying to figure out what made the perpetrators tick but now there is a psychological component for the victims, and for survivors. some of the runners of the boston marathon they could experience survivor's guilt, right, for bringing family and friends to marathon, for being there, people who ended up