What should a referee do when they notice a foul without their partner’s intervention in their primary area?

When a referee notices a foul in their primary area without their partner's intervention, assisting with the call is critical to ensuring the accuracy of the officiating. This is because referees are trained to work collaboratively to maintain the integrity of the game. By taking action on a recognized foul, the referee can help uphold the rules and fairness of the match.

Even if the foul was not originally called by a partner, the observing referee has a responsibility to address the situation, as ignoring the foul could lead to perceived inequities in officiating. This approach not only aids in accurate game management but also supports the overall effectiveness of the refereeing team.

In contrast, the other options could undermine the integrity of officiating. Ignoring the foul would suggest a lack of responsiveness that could lead to frustration among players and coaches. Notifying only the player does not address the foul as it should, and unilaterally making a call disregards the principle of cooperative officiating. Therefore, assisting with the call embodies the team-oriented approach necessary for successful game management.