John let out a blood curdling cry when the creature pressed down on his arm. He had been stupid, arrogant. He was fairly certain it was broken. Fighting through the extreme pain and discomfort he was in, he focused on his spellwork, pressing his hands into the murky ground.
His eyes reopened, staring up at the beat, glowing bright orangey-red. They used to glow orange before, but with the Demons blood in his system, the colour had changed somewhat. His magic was fuelled by the leylines and it was fuelled by the Demon blood in his system. Powered by the pain he was feeling too. Oh, John knew how to channel his pain the right way.
"Omne iter ignis!" he shouted, and with that not only did his hands ignite, but this time the fire spread. Once it caught the surface of the ooze around them, it spread fast, lapping up the walls and then engulfing the beast above him.