Serena flinched and asked weakly “Chas…what is he doing?” They heard things falling over and one cursed word as Joh hit his head. Then he appeared and set down a scroll and opened it. “We are dealing with a Japanese demon…I know this one. Nasty buggers but we can fix this”

John laid the scroll in front of Serena and pulled a small blade from his pocket and cut his palm. He let blood drip onto the scroll and then said “Serena, we need to take your shirt off. That oil needs to go on the wound. Which my guess is on your back” 

Serena sighed and tried to take it off but couldn’t on her own.