What should a referee do if they observe a player using excessive force?

When a referee observes a player using excessive force, it is crucial to uphold the safety and integrity of the game. The appropriate action in such a scenario is to issue a red card for violent conduct. This is because excessive force typically indicates an intention to cause harm or demonstrates a reckless disregard for a player's safety, which falls under the category of violent conduct.

Issuing a red card is a clear and decisive measure that signals the seriousness of the infraction, leading to the immediate ejection of the player from the match. This not only addresses the specific incident but also serves to deter similar behaviors from other players, reinforcing the standards of conduct expected on the field. By removing the player, the referee is prioritizing the well-being of all participants, which is a fundamental principle of fair play.

Other actions, like issuing a yellow card or simply warning the player, may not adequately address the severity of the situation, as they do not reflect the necessary response to a potentially dangerous act. Allowing play to continue without intervention would undermine the referee's authority and could result in further incidents.