Glad for the words that Peter spoke up, he started to pat him on the back before the rather rude interruption by Sirius, whom they had all been awaiting. As the Gryffindors gathered about took stock of Sirius's words and many looked affronted, James felt his eyebrows lowering in what had to be a combination of annoyance and disgust.
He had to remind himself that Sirius hadn't been acting normally for the last few days, and after he reassured himself that he wouldn't try to punch him again, he sauntered over to Sirius and tugged hard on his arm, putting enough force into the pull to make sure that he and his errant friend were face to face.
"Padfoot," he whispered, hoping that using his nickname might spark some sense in the other boy, "you're not yourself right now. Shouldn't we go up to the dorm and let you rest it off?" It was a question, but not necessarily an option as far as James was concerned.
He tossed an apologetic look around to his friends, hoping that they wouldn't get too upset with Sirius's behaviour. Some of them had already experienced the erratic change in his dorm-mate, but others might be new to the experience.