" Then it rose to 2500. The firefighters began to worry about a flashover, a dreaded situation during a fire in which everything in a closed space—even smoke—becomes so hot that it reaches the point of spontaneous ignition, causing a complete and consuming eruption of fire from every surface. As firefighters put it, it’s the moment when a fire in a room is transformed into a room on fire. With the temperature as high as it was, there was a great potential for flashover, which would have made the chance of saving anything nearly impossible. "

― Susan Orlean , The Library Book