The raven nodded and followed John out, flying ahead of them. John cursed and said "Guys come on! Its leaving without us!" He ran after the bird, hoping he wouldn't lose it. When they got to the alleyway they saw Serena and the demon. The demon seemed to be chanting something, a silver energy was flowing out of Serena and into the demon. 

John cursed and said "Its draining her aura, we need to stop this now" He muttered a spell and a fire ball came to hand and he threw it at the demon, making it turn around and look at them. Serena was barely awake when she saw them. She grunted "No...guys...get out...of here..."