Midway through the fourth quarter Saturday night, with the Boston Celtics holding a comfortable 16-point lead that was virtually insurmountable for the injury-riddled Los Angeles Lakers, Kyrie Irving saw his 270-pound former teammate heading to the basket. LeBron James got a step on Al Horford, and Irving abandoned whom he was guarding and stepped right into James' path. James plowed into Irving and struck the point guard in the chin with his elbow.