In the Bundesliga match where Bayern defeated Augsburg 3-2, Boy fainted Augsburg midfielder Fairhall while competing for the top, and the opponent was directly carried away by a stretcher. After the game, Augsburg coach Wagner said in an interview with Sky Sports: "It may take two to three weeks to recover. It was a serious concussion or a very rough foul. Of course, I don't think the other party was intentional. The player's family came to the locker room crying because he had to go to the hospital, which was really heartbreaking. It was not an ordinary injury." Wagner criticized Boy: "The only thing I hope is that he doesn't act that way. So cold, as if you are superior, you should apologize immediately, rather than wait until you see the other party unable to move. In addition, some people on the Bayern bench should also react faster, rather than complaining that it is not a foul, and you must not do such a thing, whether you are Bayern or other teams."

According to Bild, their reporter asked Boy about his opinion on Fairhall's injury in the player channel, and the player turned his head and got on the Bayern bus without saying a word. But then, Boy publicly apologized to Fairhall on social media.