What went on in the time immediately after Dumbledore's escape would have driven a saint to drink. Umbridge, of course, was now Headmistress. To consolidate her control, the toad had instituted an "Inquisitorial Squad" composed of "hand-picked students" who supported her so-called aims. Of course, that suck-up Malfoy was on it, and he and his fellow Squad members had privileges we prefects didn't have, like docking house points. Soon every house but Slytherin was haemorrhaging house points by the dozen.