We'll see. Maybe that was the trigger?? Maybe they were going back in his school records???
Since he was in the school the day before arguing with 4 persons (3 are dead), I'd say LE and others know what this was all about.
Interesting—and I’d think quite possible.
The LE sure has been hinting enough that they seem to know what transpired.
So I think you’re right....there’s a back story here.