Which situation requires immediate action from a security guard?

Witnessing a robbery in progress is a situation that necessitates immediate action from a security guard because it involves a criminal act that can pose a significant risk to individuals' safety and property. The presence of a robbery indicates an urgent need to intervene either by ensuring the safety of victims, contacting law enforcement, or taking steps to prevent further escalation of the situation.

In contrast, minor disturbances between employees, reports of a missing item, and routine patrols are typically situations that can be managed with less urgency. While these situations may require attention and appropriate responses, they do not present the same level of immediate danger to life or property that a robbery in progress does. Thus, the security guard must prioritize responding to serious incidents like a robbery to protect people and property effectively.