 Given that the options of submitting to God and saving Isaac are incommensurable (and even if they were only incommensurable as far as a reasonable person could tell), Abraham’s deciding to submit to God seems rationally permissible. So it is easy to see how Abraham’s situation might prompt him to set out for the mountain in order to sacrifice Isaac. But it is also easy to see how, once at the foot of the mountain, Abraham might decide to turn back. For, even though, as Broome puts it, “turning back at the foot of the mountain is definitely worse than never having set out at all” since “trust between father and son [has already been] badly damaged” (2001, 115), the option of saving Isaac by turning back and the option of submitting to God and sacrificing Isaac may be incommensurable. This becomes apparent if one recalls Kay’s case and labels Abraham’s above-mentioned options as follows: