The Distinction Between Act and Potency

If a mover is going to infallibly move something doesn't that demand that the movement be infallible but not resistible yeah well i mean if it how is there a distinction between this and irresistible with respect to efficacious grace? I don't think so. It's kind of like trying to understand time travel once you've done something in a certain way it's according to the nature of time it's impossible to go back and have done it otherwise. But that doesn't mean that in the moment of choice you didn't truly have a whole slew of options in front of you. There isn't really a distinction between act and potency in other words um if something is in act in a