most logical explanation = trying to determine if the bomb threats had anything to do with today, and if they did, why.
It doesn't sound like this guy was some nutso running around like an idiot with guns. This was a well planned out attack. So no, applying logic to his actions isn't really that big a stretch. Applying logic for his reasoning is another story.
Probably testing the response system.
i dont think this was a nutso thing. I think he planned this out. I mean look at the way he went about it.
there are 2 shot, then a couple hours later, probably about as long as it would take a guy that JUST popped 2 people to make his way across a large campus, while staying hid, the other killings start.
that sounds to me like a diversion. pop those first 2 real quick (at an early time when probably there arent AS many out, then go over to a more busy section when its a little later and more people are up and about. He wanted to do damage and went about it pretty well.