Before Remus could do or say anything, Lucius Malfoy had swept in and dragged Sirius off into the crowd. Lucius Malfoy? It didn't make any sense. Sirius couldn't stand Malfoy, or anyone like him. Why would he be coming in to dance with him? What was going on? Remus tried to look through the crowd to see if he could see them, but there were too many people bumping and grinding, obscuring his view.
He was left alone, which was exactly what he was afraid would happen. But that wasn't what he was most worried about. Sirius was who he was concerned for.