 In the first case, Schaffer contends that Merlin’s spell caused the prince to turn into a frog and that Morgana’s spell did not. Merlin’s spell, after all, was the first spell of the day, and that’s what the laws of magic identify as the relevant feature. And, in the second case, Schaffer contends that the Major caused the Corporal to advance, and the Sergeant did not. After all, the Corporal listens to the orders of the highest ranking officer, and in this case, that’s the Major. (For further discussion, see Lewis 2000; Halpern &amp; Pearl 2005; Hitchcock 2007a; Halpern &amp; Hitchcock 2010: §4.2; and Paul &amp; Hall 2013: §4.3.4.)