John was grabbing things and pouring them into a bowl he had grabbed on his way over, muttering over it as fast as he could. Then he looked up and said “alright, this is going to hurt, a lot. But we have to do the fast method to save her soul in time..the nasty bugger is poisoning her very soul...if she were a full human, she would already be a soulless vessel of the demon world...” 

Serena was shaking, sweat pouring all over her. John finished mixing and then put the mixture onto the bite then moved to put it on her face. “Chas, you will have to help hold her down...Kay? Don’t let her move or let her give up, alright?”

He moved so her head was in his lap now and he started chanting over her, a seal appearing around them as small trails of red smoke started to lift from Serena’s body. As this happened Serena cried out in a new level of pain, trying to move away.