Supposedly, a teacher propped ot open to go out to her car, to get her phone, saw the maniac approaching and ran back inside, leaving the door propped open.
Probably didn’t want it to close and lock her out, forcing her to go around to the main entrance.
That teacher needs to be put in front of a bank of microphones and explain her actions. Her behavior should be criminally prosecuted. Her action alone made this crime spree possible.