sentences:  The traps he created can be seen as a manifestation of his anger with people who he feels do not appreciate having their life, when his unborn baby was killed before having a life of its own.Although it has never actually been identified in the films, "Billy" is the name by which it is referred to by writers, directors, and members of the cast and crew on documentaries and interviews.The name was given to it by creator James Wan, who is the director and co-writer of "Saw".