Dismembered twitchers/Krypande appear on the sewer level that was supposed to be where the construction workers were stationed, in the place where you find a locked door with a code written in the clipbook page. They reside in dark places and generally have a solitary disposition, never encountered in big numbers. They are not necessarily dismembered, but they don't retain lower body motor functions, much like Sick Simon (aka Wheelchair Simon). They often appear in spaces you are forced to crawl through, but attack slow enough that you can still dodge their attack while crawling. The monsters very slow attacking and inability to use its legs is a symbol for the weakness that Simon has, regarding the fact that he can't take his life anymore and ends it in 3 of the 4 endings, and the fact that he can't use his legs anymore.