Rookwood was a prick, a twat, a motherfucking egotistical proud bastard. The long lists of names helped Sirius stay focused - as well as not have them actually come out of his mouth, which wasn't wanted. The whole not looking for a fight biz. And really, Rookwood was playing it all just so. Crazy shit wear nice clothes give a nice smile speak politely load of bullshite that passed for conversation with the sorts Sirius had said 'fuck off' to in order to live life as himself.
The prat wasn't giving any sort of loose form to the school year. They were known troublemakers, and those who hadn't turned in homework had already been punished in class for that. Regardless of their connection to Remus and the likelihood of an attack on that smug face, what was that sort of man like to do to show his disapproval of troublemakers?
If that bastard wanted to spin his load of shite how he wished, Sirius was just as capable. How did the teachers think he completed half his assignments anyway? "Our curiosity and learning hasn't been limited merely to classroom walls," Sirius replied with a perfectly civilized tongue.