When encountering an emotionally upset bystander at a mass-casualty incident, the best response is to:

Assigning an emotionally upset bystander a simple, non-patient-care task is a strategic choice in a high-stress environment like a mass-casualty incident. This approach helps to engage the bystander in a constructive manner, redirecting their focus from their emotional distress to a specific and manageable task.

Involving them in a way that doesn't require direct interaction with patients can lessen the chaos around them while also providing a sense of purpose and control, potentially helping to calm their anxiety. Simple tasks may include providing logistical support, such as directing traffic or helping to gather supplies, which keeps them involved without overwhelming them or adding to their emotional burden.

This method not only benefits the bystander by giving them a role but also helps the emergency response team manage the situation more effectively by reducing distractions and maintaining order at the scene.