Which grip is NOT typically used for high heat, low visibility firefighting?

In high heat, low visibility firefighting scenarios, the shoulder grip is not typically used due to its potential limitations in maneuverability and control. Firefighters need grips that allow for quick adjustments and a secure hold while navigating through hazardous environments.

The shoulder grip can restrict movement, making it difficult to adjust the nozzle angle or distance effectively, which is crucial when dealing with intense heat and poor visibility. In contrast, grips like the arm lock and hip grip provide stability and better control, allowing firefighters to maintain a strong hold on the equipment while also being able to react swiftly to changing conditions. The high grip, while maintaining a firm grip on the hose, also allows for better body positioning and control, essential for effectively managing the water flow and navigating obstacles in a fire scene.

Thus, the shoulder grip is less suited for the specific challenges presented in high heat, low visibility situations, making it the least appropriate choice among the mentioned grips.