"What sort of breech?" This was spoken by Harry the second he and Hermione stepped out of the Floo into her office. She saw Malfoy and Blaise walk around her office, wands out, muttering incantations and spells. "We’re not entirely sure, we think it was just someone trying to have a look round, but the warding scared them off." Blaise had complete faith that whatever wards Draco had set up, most wizards, dark or light, would be scared of them. 