Throughout the day, everywhere they went they saw signs of tighter security; Professor Flitwick could be seen teaching the front doors to recognize a large picture of Sirius Black; Filch was suddenly bustling up and down the corridors, boarding up everything from tiny cracks in the walls to mouse holes. Sir Cadogan had been fired. His portrait had been taken back to its lonely landing on the seventh floor, and the Fat Lady was back. She had been expertly restored, but was still extremely nervous, and had agreed to return to her job only on condition that she was given extra protection. A bunch of surly security trolls had been hired to guard her. They paced the corridor in a menacing group, talking in grunts and comparing the size of their clubs.