In what scenario would the heel of the fire be of most concern during firefighting?

The heel of the fire is of particular concern when establishing a perimeter because this area can represent a less controlled and more unpredictable segment of the fire. The heel typically refers to the part of the fire that is less influenced by wind and other external factors, making it potentially more hazardous as it can be the area where fire spread may be more erratic.

Establishing a perimeter involves ensuring that firefighters can safely engage with the fire without risking exposure to sudden changes in fire behavior. Understanding the dynamics of the heel—how it interacts with the rest of the fire and its surroundings—is vital in creating an effective containment strategy and ensuring the safety of personnel. This emphasizes the importance of assessing the heel's characteristics to avoid any unintentional fire spread and to maintain control over the situation.

In contrast, while all the other scenarios involve risk management and safety considerations, they do not specifically prioritize the concerns associated with the heel in the same immediate and direct manner as establishing a perimeter does.