They used sheer magical power to burst open the doors, which flew off in different directions. The breeze generated by the flying doors extinguished all the candles lighting the room. There was silence for a moment and then chaos erupted - screams and the sound of crying carrying across the hall. Glancing about to make sure no children were hurt, Hermione cast some impenetrable shield and repellent charms covering the student body - they were only there for the teachers after all.