After having this discussion with Sohala, I'd like to remind you of one important aspect of how the ad-libbed aspects of prose writing in this game are handled:
Mechanics are never turned off!
That means that the abilities of a character you portray during non-combat, history, or other activities should always correspond to what's on your sheet. Also ad-libbed combat scenes, the outcome of which should be clear or meaningless, must adhere to your character's abilities. Of course for things like Background and history you can just say you rolled well, but during the game we should always keep the conflict resolution mechanisms in mind. Remember, the world works by the rules, not by realism. Colour can be used to mask the rules, but not replace them.