When all sorts of members of the Weasley family descended upon them Sirius decided it was probably best to keep his mouth shut - he wasn't the one who had started this, and as much as he would have been happy to finish it, he wasn't going to do this here. He let Ron spout off whatever his grievances were to anyone who would listen and just reminded himself over and over again that this was not the place, and with so many people around it was unlikely he'd get to the red head before someone stopped him anyway.
"M'fine." He told Remus with a sigh, his face still ached, and though his nose had been mended he could still feel the pain of the break, and he thought he'd never want to hex anyone more than Snape - but right at this moment he might have been willing to change his mind.
He nodded at Harry's suggestion, because this didn't need to ruin the night for everyone. "Let's go back in the house." He told James quietly, mostly because he wasn't sure how much longer his patience would last and to help James calm down some before things really got out of hand.