WALTHAM, Mass. -- Boston Celtics guard Kyrie Irving took responsibility for a profane outburst directed at a fan in Philadelphia that yelled at him and referenced LeBron James during Friday's game against the 76ers. In a video that circulated on social media after Friday's game, a fan is heard shouting, ""Kyrie, where's LeBron?" as Celtics players walked down their tunnel to the visitor's locker room at halftime. Irving appears to look up towards the fan before offering a profane response. Irving said he talked to the league office about his outburst on Saturday but was waiting to hear if he'd be fined. Asked if he had any regrets about the incident, Irving was emphatic he did not. "Hell no," said Irving. " [The fan was] man enough to record it on video, then that's all him. I'm glad he got his [social media] name out there and then, kinda, 5 seconds of fame and it going viral -- that's the social media platform we live on. I take full...