As "The Professor", he proceeds to wrest leadership of the gang (and the admiration of Jo) away from Rocks, making him extremely resentful. When they rob a fur warehouse, Rocks locks his rival in a cold-storage vault, but Clitterhouse is freed by Butch, a gang member that Jo had assigned to keep watch on him.
As "The Professor", he takes control of the gang and Jo's admiration away from Rocks, leading to Rocks' intense resentment. During their robbery at a fur warehouse, Rocks locks his rival in a cold-storage vault, but Clitterhouse is freed by Butch, a member that Jo had assigned to keep watch on him.