the shooter could have left this flash drive, right, all of these writings for the police. he could have done it any way he wanted to do it. he chose one person, one randomly, the one with the glasses, the one lucky one, he called them. why did he do that? >> many time these types of shooters choose representationalt representationaltar targets. they also may choose a representational person's life to spare and this person, matthew, perhaps looked like someone from the past, perhaps they had a casual glance to each other walking down a hallway a few days before, maybe sometime in the past and for that reason this was the one person that perhaps the shooter related to and said, you know what, you're going to be the one i spare. i cannot only take life but i