Go to the part where Hellboy's fighting "Stinky." When "Stinky" jumps onto the train full of people and Hellboy tries to get on, the conductor beats him with a tank. Hellboy falls under and his horns turn red-hot. He touches them and goes "Ow!" like he burned himself. Wait. I thought Hellboy said he was fireproof? He managed to electrocute "Stinky" without a scratch, then says "I'm fireproof. You're not," and later Liz floods the place with blue-hot flame, and he's still not even burned. Yet he burns himself on his own horns?