that pretty often. >> dr. this is jaime colby, i wanted to ask you this question during greg's interview where i learned so much. what is the difference between a young child that bullies another child, a domestic dispute and someone that may be cape cable of doing something so heinous as this? if we had the chance to do an autopsy as greg assures me they are on the older brother and study his brain what could be learn about terrorism if in fact he is guilty of what we saw unfold this week? >> those three items are a great concern to all of us. they can be very difficult in most cases. in a few circumstances perhaps lining this one they could be on a continuum. bullying implies that they take advantage of their strength or undo