When he did not hear an argument, he relaxed a bit more against the stone. Sure he had an argument prepared. If an auror was too tired then they were of no real use to him. He was of no use to him in this state really. He had hoped that they would be able to gather up the students and just hunker down till this all passed. However it seemed as if the students had other ideas and really he could not blame their prefects too much. The prefects were just kids too and were now stuck basically guarding their entire house. But with that in mind that did not mean the urge to strangle them was any less.
He chuckled a bit as he heard her yawn. He was tired but she seemed worse off than he was. Alastor was used to running off of fumes till there was nothing left. She was warm against him him and he would be an idiot if he did not admit that the castle was colder than it should have been.
"You take the first nap." he said, opening his eyes and looking over at her from the corner of them with a bit of a smile. "And that's an order so no arguments. I'll wake you up in half an hour."