 David Lewis tells us to think of the argument as a reductio (Lewis 1981). A compatibilist is someone who claims that the truth of determinism is compatible with the existence of the kinds of abilities that we assume we have in typical choice situations. Let’s call these ‘ordinary abilities’. The Consequence argument, as Lewis articulates it, says that if we assume that a deterministic agent has ordinary abilities, we are forced to credit her with incredible abilities as well.