After the Quibbler affair, Umbridge apparently felt that she had to flex her muscles and demonstrate her clout. One evening, Harry was off with Snape doing Occlumency, and I was in the Gryffindor common-room getting caught up on my studies, when a woman's scream echoed through the castle. I was out of the common-room and down the corridor in a second, my wand in my hand and every Gryffindor in hearing-range behind me. As I ran, I had beautiful visions of Umbridge having finally provoked McGonagall beyond endurance. That would have smoothed my path considerably.