Extinguish
You can expend all remaining charges of this weapon (even if it has only a single charge or use) as a swift action to remove the burning condition from yourself or an adjacent creature, or to quench the flames in 1 square. If the weapon affects an area, it extinguishes all flames in that area (including ending the burning condition for all targets fully within the area). Extinguishing flames does not prevent the area from catching fire again, especially if flames survive nearby.
Source
Armory pg. 27
