A person, usually appointed, who decides the issues or results, or supervises the conduct, of a competition or conflict
To make a decision about (a controversy or dispute, for example) after deliberation, as in a court of law
He was appointed as the referee in all disputes.
When admonishing players, the referee should speak with dignity, politeness and in a firm manner.
Happily the referee had seen some shenanigans in the 6-yard box with Ruddy unfairly impeded so a United freekick was the award.
An astute referee will have conditioned his mind to totally accept the accuracy of his intuition, which is very rarely proved wrong.
You should not contradict what a previous referee has said.