Antistone said:
Then you should also believe that the hero can drink a potion, move a space, or make an attack, as those things can also all be done at any time during the hero's turn. You haven't identified any reason that a hero might be allowed to spend fatigue on movement points but NOT do any of those other things.
Can you refer me to the text where it says that moving a space, making an attack and drinking a potion can be done at any time during the hero's turn?
That specific wording is only in use for using fatigue for movement, placing orders, and using skills. Other than that, I have no justification for my stance. However, the fact is that other potential actions do not include this wording.