He heard James' footsteps echoing behind him. He moved a bit faster, although he was aware of the fact that, if James wanted to overtake him, he would. James had proven on many the occasion that he had little problem with grabbing him from a public place. Regulus could only hope that James wouldn't do that now, because Regulus was certain that if James decided to do that, Regulus would hit him - and, if Regulus was being brutally honest with himself, he knew he couldn't win a fistfight against James. A duel, he might have been able to hold his own in. But not a fistfight.
But James didn't go any further. Which was a relief. Regulus could always think a little more clearly when there was a decent amount of distance between them. He could remember that James had always been an arse, had pushed him when he didn't want to be pushed and had been the one that had helped to steal his brother away from him.
Regulus couldn't help but completely stop when James asked if he had been the one to get him killed. He still didn't turn to look at James. But, he could marvel at the other's arrogance. Everything had to be about him. He wondered what it was look to be so entirely fixated on one's self. He wondered why James would even begin to think that he was part of the reason that Regulus had gotten killed. But then, the conversation they had had in the library had made little sense either. It was as if James' history was entirely different from his own.
But for the moment, he didn't really care. There would have been another time when he would have tiredly asked James what the hell he was talking about. But today there was little that James could say or do that would make Regulus wanted to be around him. Regulus didn't answer James at all; Regulus ignored James.