“It’s time to fight fire… with fire,” the protagonist declares dramatically. It’s how we know that the situation has become so dangerous and volatile that the heroes have no choice but to respond to their adversaries in a similarly dangerous and volatile manner.
“Now I’m ready to fight fire with fire,” I thought to myself as I prepared to douse a painful sore throat with an array of differently temperatured liquids. “Except that fire isn’t at all like a sore throat, and this glass of orange juice and sprite is like the complete opposite of fire.”
Fighting fire with fire would pretty much be the worst idea ever. All you would get when adding fire to something that’s already on fire is… more fire. It would be like getting into an argument with the ocean and then tossing a glass of water in its face. “Take that, ocean! Now you’re… more moist!” (I guess it would depend on which ocean. Maybe the sassy Atlantic. I’m sure it would be difficult to get into an argument with the Indian Ocean, which I’ve heard is very polite.)
Some situations call for action, to give as good as you get. Having a sore throat is one of them, just make sure you use cold medicine or lots of water and hot tea. Don’t use fire.
Anything but fire.