fight-fire-with-fire

I know you're just trying to be kind. But the world isn't always kind. So sometimes you have to know what you're up against, and match it.' He held up a hand to stop the words about to be spoken; I could see the vague shape of it hovering in the blackness. 'I know it's not right to fight fire with fire. But sometimes, it's all we've got." His voice grew soft, and, in the darkness, his hand found mine, squeezed. 'Don't put your fire out, Kaitlyn. Use it, or pass the torch.