This is what doesn’t make sense - If he shot the girlfriend in the 7 am incident, then who was he looking for in the mid-morning attack? (The perp has been described as “looking for his girlfriend.”)
It could be “I have nothing to lose now, I’m going to take out everybody” type of situation. He shoots the girlfriend and then goes out and loads up.
Brief complete speculation: His girlfriend said she slept with other kids (maybe to “hurt” him), and so he walks to her class, and says “I’m looking for (her name), and anybody who says they know the name he shoots?.
But since some reports say he didn’t ask anybody anything, I’m just watching for more definitive information before drawing any conclusions. I’ll just say that so far I have no problem believing any of the story, but seriously wonder why, after a 7:15 am shooting with a gunman on the loose ANYBODY was in a classroom 2 hours later.