After Dexter breaks a promise to Brother Sam and spontaneously kills Nick , he begins to visualize his deceased brother, Brian Moser , as a representation of his inhumane urges. Brian doesn't care who is killed...he just wants a kill. Brian pressures Dexter to forgo the essentials of the Code, such as being certain of his victim and whether or not they are innocent. ( Nebraska ) Dexter begins to imagine a life of killing without constraints, but concedes that the Code is what protects him. Dexter finally resolves his inner conflict by running a car into the illusion of Brian.