I guess things that you really don't want coming back tend to come back anyway, especially for Evan and the monster blood. It has returned to haunt him now during his daily life in school. The looks of this blood may be nasty but it has a tremendous effect after you eat it. For humans, it may enlarge your size but for other living creatures... you become a large, vicious monster. This book wasn't that scary for me but for Evan, it was a nightmare having to deal with large problems. A liquid that can put harm in anyone even if it was eaten by mistake.