This exercise is a clear attempt on Goddard's part to desensitize Rowan to the act of killing. Citra will later mention that though people are immortal, it's still impossible for people in this world to differentiate between real and temporary death—which means this will be traumatizing for everyone involved. Rowan's euphoria afterwards suggests that Goddard might be correct that there's something violent latent in all people—just like kindness, however, acting on one or the other is a conscious choice.