"I would’ve never believed it of the four of you. Nott and Malfoy, especially. Potter I might’ve —should’ve expected. Granger! I expected more sense out of you.Filch did not even make mention of you, Mr Longbottom, what are you doing here? Professor Rosier three of your students were found in the Astronomy tower! It’s one o’ clock in the morning. Somebody explain!" This was probably the most frazzled Harry had ever seen Professor McGonagall. She looked both furious and there was a profound sort of sadness hidden there, juxtaposed with one of Harry's favourite recent memories of her laughing. 