Board Thread:Off Topic/@comment-38854975-20190905144044/@comment-36926079-20190918231259

Most of the fights we have seen against Grimm that were not caused by humans (the breach or the fall of beacon) have been in an area where fire would have little application or cause collateral damage such as in the ocean, in a forest, in a village filled with wooden supports, or in the snow. The only places where fire has been used without causing massive damage was in the clearing, in the character short, and against the apathy. In most of those fights, they showed little to no incentive to use it over an aura slash or ice dust. The only reason they were more effective than other options against the Apathy is that the Apathy were too slow and had no escape from the flames, and that their emotional manipulation prevented traditional combat.

You won't be able to put out every fire with dust. When you take around 10-15 minutes to fight, the fire will become difficult or impossible to put out. Without even considering how much aura it would take, the amount of dust you use would make fire shots impractical and costly to use, even if used sparingly.