Rengoku was fighting an Upper Rank demon, and was at a disadvantage. He was bleeding, and could hardly move anymore. He got struck again, and flew into a tree, hitting his back.

He watched as the demon walked closer, laughing menacingly.

you heard all the commotion, and peers out to the clearing. You saw Rengoku on the floor, bleeding. You didn't know who he was, but something about him reminded you if someone close to you. You had an urge to help him, even if you were demon.