What is the last step in the PASS fire safety procedure?

In the context of the PASS fire safety procedure, the last step is to sweep the extinguisher from side to side at the base of the fire. This action ensures that the fire is thoroughly extinguished and prevents it from reigniting. The sweeping motion helps to cover a larger area effectively, targeting the flames while minimizing the chance of smoke inhalation for the person using the extinguisher. Understanding this final step is crucial, as it emphasizes the importance of not only putting out the flames but also ensuring that the fire is completely out before considering the area safe.