Helen Steward argues that action is the exercise of a two-way power, and that if there are actions, then determinism is false. The concept of a two-way power has its roots in Aristotle, but Aristotle's conception of a two-way power is compatible with determinism. I explain the differences between Steward and Aristotle's conceptions of two-way powers and point out how a compatibilist opponent to Steward's argument could exploit an Aristotelian conception of two-way powers. This leads to a dialectical stalemate between the imagined Two-Way Compatibilist and the Agency Incompatibilist. In conclusion I sketch a neutral conception of action as the exercise of a two-way power that sidesteps the dialectical stalemate whilst retaining the best aspects of Steward's account of animal agency.
