There were a couple of classrooms where the cops went where there were no students nor teachers. Everywhere they went there were no teachers or students. Maybe they all quickly went out the back door and hid in the bushes.
The reason the rooms were empty is BECAUSE when the shooter shot in the door the it set off the alarms, they ALL gathered the 200 students into lockdown, I don’t know HOW those 6 people ended up shot or NOT IN the lockdown facility!!{