Fiendfyres had been roaring around the battlefield like hurricanes, sometimes as many as twenty at once. By the time someone managed to douse the flames, they had consumed a few Order soldiers. And between all the angry red and orange were constant flashes of the Killing Curse's green. Yes, the Order has long ago yielded to the undeniable reality of using the Killing Curse, but the Death Eaters were so much more accustomed to the darkness and utilised it as casually as a Lumos.