Fire fighting is all about being ready for anything at anytime.
It begins with the address which triggers a practiced cadence of actions based on pre-planning and experience. Leaving the hall the flag will show prevailing winds and on route the sky can reveal conditions at the scene. A picture of possibilities and what to fear is formed and acts as a starting point. It also activates the mind to performance levels. As the scene comes into view new decisions have to made quickly and accurately.
That's the POINT OF THE ARROW.