harry no controla bien el hellfire

"I took measures to contain it," I said. "I did everything I could think of and for a while I thought I'd been successful." I sipped more beer. "Then last year, I realized that my magic was being augmented by a demonic energy called Hellfire. That's what you smelled tonight, Billy, when I flipped the car."
"Why do you use it?" Billy asked.
I shook my head. "It isn't my choice. It just happens."