These firefighters are not using water to extinguish the fire. Instead, they are scattering some fire starters into the grass. It's a lie that you can't fight fire with fire. Some forest fires are so large that simply using water to extinguish them cannot keep up with the speed of the fire's spread. Therefore, firefighters will burn all the combustible materials a certain distance ahead of the fire front. When the fire reaches this area, there is nothing left to burn, and the fire naturally goes out.
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