Referees carry whistles, books for yellow and red cards … and now firearms.

Brazilian ref Gabriel Murta is under fire for pulling out a gun during a soccer match in the city of Brumadinho this weekend, after players and a manager from the Amantes de Bola team allegedly kicked and slapped Murta for failing to issue a red card to the opposing team.

According to the Telegraph, Murta retrieved the weapon from the locker room and then waved it around on the field, before being restrained by a linesman. Giuliano Bozzano of the Referees’ Association explains Murta felt “threatened,” and used the gun in self defense.

Murta, who is also a police officer, is set to undergo a psychological evaluation on Tuesday. He faces a potential lifetime ban from the league.