Fred and George had made sure nobody was likely to forget them too soon. For one thing, they had not left instructions on how to remove the swamp that now filled the corridor on the fifth floor of the east wing. Umbridge and Filch had been observed trying different means of removing it but without success. Eventually, the area was roped off and Filch, gnashing his teeth furiously, was given the task of punting students across it to their classrooms. Hermione was certain that teachers like McGonagall or Flitwick could have removed the swamp in an instant but, just as in the case of Fred and George's Fireworks, they seemed to prefer to watch Umbridge struggle.