Final answer:
A security guard can assist in resolving minor disputes, but if the situation escalates into a physical confrontation, it is necessary to call the police.
Step-by-step explanation:
A security guard can help resolve a minor dispute that can be easily defused. They can intervene, mediate, and diffuse the situation by using their communication skills and knowledge of conflict resolution techniques. However, if a dispute is seen escalating into a physical confrontation, it is advisable to call the police for immediate assistance, as they have the authority and training to handle such situations.