how did he get into the school? wasn't it locked? not that a lock will keep out a madman but it seems like he just waltzed in.
i remember being in elementary school in the late 80s-early 90s and sometimes a teacher would get a "visitor" and it would be some student of theirs from a bunch of years ago coming in to say hi. i went back to that same school around '01 to see a teacher that was retiring, and was able to waltz right in and roam the hallways and didn't even get any suspicious looks. 2 years later, in '03, i returned again to see another teacher and some new renovations and the lobby door was locked. i looked through the window and didn't see anyone i recognized and there was this whole protocol for visitors posted and a uniformed security guard so i just left. i remember thinking to myself, "damn, shit's different now" and it gave me a sad feeling to think that such security was necessary just 7 years after i graduated.
that was almost 10 years ago. i'll admit to not having all the details here but it seems suspicious that there wasn't even enough security to stop a random person from getting to a packed classroom today, and that bothers me.