New suggestions at 12/10:
1. Do more things on "alert system" and common people's behavior. As normal, we know the alert level will rise if your action has been saw, and decrease over time. The alert system although not founded from you, but founded by you, so people's behavior differently depending on the alert. The alert may based on the current value to divided into about five stages.
2. Similar to the first point above. When the alert stage is low or zero, common people acting as normal, nothing is changed, alert report decrease quite fast. After about the alert rise to 10, the teacher may starting patrolling. After about 25 later, rumors spreading and the "adventurer" starting randomly check some of the lockers, abduct them to stop them, if they found nothing cause alert level down, if they found something to cause alert level rise substantially. And the alert keep rise, the guards now stating patrolling, numbers of the girls decreasing. Alert in high level cause some room shut down.
3. Keep continuous to the second point above. The best way to decrease the alert, just switch to another room and keep low profile, abduct witness too.