A further objection asks: if capacity already existed and nothing changed, what preferred performance to nonperformance? Why did one outcome occur without an explanatory preference?
The answer points to other conditions, the removal of impediments, and the person’s particular intention. Assuming two states are identical in all relevant respects while assigning an act to one and inaction to the other is itself part of what needs justification.
The reasoning does not deny ordinary human ability; it challenges the claim that prior ability alone completely explains why an act occurs at a given moment.