| Its all about the narration.
I guess we need to drag the old Voltron example again:
Voltron has a signature move where he takes out his sword and cleaves the Big bad in 2, episode over.
Theoretically Voltron can do this every single time, whenever he wants. WHy doesnt he just do it at the first sight of the big bad?
Because then Voltron episodes would only last 5 minutes each, and they will be boring as hell.
So Voltron only uses his signature move when the time right from a narration POV. As for D&D when is the time right? whenever the narrator of the character AKA "the player" decides it is right. | 
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