How is Chillingworth described at the end of the chapter? Why?

Some townspeople have an innate intuition and are skeptical of the physician's true motives. They sense that Chillingworth has undergone a profound change since arriving in Boston, going from a genial old man to an ugly and evil person. Thus, "it grew to be a widely diffused opinion that the Reverend Arthur Dimmesdale ... was haunted either by Satan himself, or Satan's emissary, in the guise of old Roger Chillingworth.” Chillingworth is being consumed by his own revenge and evil control issues. He is essentially a "leach" drawing the life out of Dimmesdale.