This isn’t really that stupid. I mean, if someone nutjob came in to my office and started mowing everything down, I’d throw whatever I could at him.
I’d start by throwing my BA II Plus ninja-throwing-star style at his trachea. Next I would throw my old CFA books, in order starting with L1 Ethics, to inflict blunt force trauma. If, the intruder was still standing (unlikely), I’d finish him off by tossing unpaid interns at him. He would have so many 23 year old kids around him asking if he needs coffee, he wouldn’t be able to move.
when I was in school, many had knives and the ones who were worried about the hand held medal detectors would carry shanks made of plexiglass. I think if there was an active shooter, he’d get jumped.