OK, playing devil's advocate here. I know its commons for all doors to be locked form the outside, save the one dedicated to being open for visitors to access the school. (Although, our kids' school, all doors are locked from the outside; you have to hit a buzzer outside. There is a camera aimed at the door and when they see who it is, they hit the buzzer internally, unlocking the door electronically so you can enter the school).
So back to Skyline School. If the front doors were open, and again thinking of other schools, isn't it customary that if a door that is locked from the outside, thats NOT a main door, to be wired to activate an alarm if its used as an exit unofficially? I know they get unactivated during a fire drill, but otherwise, don't they have alarms on them to make sure no one is exiting (like a kid wanting to cut class, for example?).
IF Skyline school had such alarms on their doors (does anyone know?) then if Kyron exited out the side door, wouldn't it be known? :waitasec: