Alex Cora was as angry as he has ever been at the umpiring crew Sunday afternoon. He explained after the game what set him off.

Red Sox manager Alex Cora was ejected in the first inning of an 8-1 victory against Minnesota in the opening game of a split doubleheader Sunday at Fenway Park. Cora became irate after the umpiring crew came together and decided to allow Byron Buxton to advance to third on an interference call at second on a pickoff attempt.

Heading into the season, MLB made interference calls around the bags a point of emphasis for umpires. Basically, the league wanted to legislate out of the game fielders blocking the bag with their legs. Still, it’s a seldom-called rule, and the selective enforcement understandably doesn’t sit well with most managers.