The way I read the post I was responding to, it came across more like the fiction had to bend to suit the rules; where this seems to indicate the rules have to bend to suit the fiction.
Which is it?
The question arises when the rules want to say one thing yet the fiction wants to say another: which one has to give way?
Given the fiction
invokes the rule, how can they be in conflict?
Take a high-level character falling off a cliff (or out of a skyship) in D&D. The fiction - as expressed by real-world common sense - wants to say that character will 99.9+% likely die on landing, while the rules - as expressed by the number of hit points she has vs the damage the rules say the fall will do to her - want to say she'll brush herself off and walk away. Do you go with the rule, or go with the fiction?
This is a good example of what I've called a broken chain of justification. There are two ways to understand this.
Character in a soaring skyship justifies taking a lethal plunge justifies a rule for plunges that aren't lethal justifies further fiction
One way to understand this is that our fictional action is "lethal plunge" which our rule does not handle. Therefore do not invoke that rule. Say something else instead. "You die", could feel appropriate.
Another way to understand this is that we helped ourselves to a resolution - "lethal" - that wasn't justified by facts about our game world. Plunges aren't lethal for high-level characters. Corrected, we should have
Character in a soaring skyship justifies taking a plunge justifies a rule for plunges that aren't lethal for high level characters justifies character sticks the landing
Building the result we think should happen into our action - i.e. "lethal" - was jumping the gun. To see this, picture that the character was not quite so high-level, so had a 50% probability of dying. We ought not jump the gun and pronounce them dead at the point of the action declaration.
But how should we decide which to choose? In both cases, fiction takes priority.
Either our world is one in which high-level characters don't die from falls, in which case we're not entitled to help ourselves to the result "dies from the fall"... and certainly not at the point of action declaration without running it through the mechanic.
Or our world is one in which falls from a sufficient height are always lethal for characters, in which case, we ought not to invoke a rule that doesn't deal with that. Given we're now in my third category - it's not covered by a rule - it's turned over to GM. (This is similar to the case I raised up thread, where the action very nearly but does not exactly fit the Assess a Situation rule. The same principle applies.)
AW manages it with rigourous rules. Some other games manage it with adroit GMing.