"Exactly. Presumably Potter is well prepared by now and could do with a good night's sleep. Go. Now!" She orders the two of them. Ginny and Ron offer him regretful looks as they obey the Professor.  "Longbottom!" Black calls out seamingly, summoning said Gryffindor from thin air. "Why don’t you help Harry put his books away?" Neville nods and so, seemingly satisfied with the situation, Professor Black turns and leaves.