couldn't this guy just kill himself instead of taking out everyone on the plane? to dr. leslie. what do you think? >> well, one thing that we find with people who commit murder and suicide is that there's this grandossity and feeling they have a right to control other people's lives in addition to their own. now, it's even rarer to find a murder suicide primarily they happen with men and 90% of the cases, at least in the ute. they tend to happen in relation to intimate partner or marital situations, family situations. >> that's the kind of stuff they're going through. >> right right. but in terms of killing a spouse and then killing ones self. >> he was saying about -- everything appeared normal so talked about their destination, and allen said that's when he seemed to get laconic, and kind of very quiet. >> too quiet. >> what do you make of that?