I see it all as heavily NARRATIVE. So, imagine a narrative description of this brutal sword fight. Its dark, smelly, frightening, and people are hacking away at each other, going down, getting up again, etc. Who the heck knows why the fighter is down? Did the orc just slam him to the ground and he's at zero hit points because he is so stunned and intimidated by this crazy orc that he just can't will himself to stand up again, or does he have a gaping chest wound? In a 40x40 torchlit room filled with 10 combatants there's no knowing. Heck, even the FIGHTER probably doesn't know if he's dying or not!
It's a bit more complicated than this, because contrary to a book/movie where the writer/director can sort of lie to the reader/watcher or twist their perception, D&D is a shared narrative, which means that whatever vision there is needs to be shared in real time with all participants.
So yes, for me it's narrative, but there needs to be a shared truth as to whether the fighter is dying or not, otherwise people will not be telling the same story at the same time.
So, that's my general view of things. I mean, yes, it means that any specific description of action, such as "The orc plunges her axe into the fighter, who goes down in a spray of blood." is PROVISIONAL.
And this is where I have a different perception, because in particular of the above. It cannot be provisional, because the other players will make decisions based on what has been described by the DM, and going back on this will just throw other players into confusion.
This is why true retcon like the one that you mentioned (I found it, and it has nothing to do with just going through the mechanics of a single attack, whether there is a shield or not) where an orc had moved, but it was later moved back because of forced movement is troubling, people acting between the description and the retcon (which, once more does not happen with the shield action) will base their own action on incorrect information.
That's the perception of the narrator at that instant in time, but it isn't necessary going to turn out to have been the actual situation.
This might work for standard fiction but it cannot work in a shared fiction like D&D.
Maybe the blood was imagined, or already on the blade, or it was a shred of the fighter's armor seen in dim light, whatever. I equate this more to CINEMATIC action than LITERARY action. That is, if you are watching some movie with a certain type of cinematography you see a kind of crazy frenzy of action and motion and sound and fury, with the characters reacting in split seconds to things they barely even saw. At the end the dust clears, and it turns out the fighter slipped on some blood and the warlord telling him she was pissed because she was looking forward to hooking up with him got his butt back in action! Poor guy now has bigger problems than before! lol.
It just felt quite frustrating back in the day to hear the endless casual dismissal of 4e based on "I refuse to entertain the possibility that my fixation on this interpretation is really because it lets me not analyze what actually troubles me about this game." Not saying that is the case here, just that its an Edition War Legacy thing, it triggers people.
And this is why I find it extremely frustrating as soon as 4e fans are involved, you guys are so touchy about this that you take everything as criticism of your dear edition. I have nothing against it, play it to your heart's content if that is your preference, but please allow me my own preferences, different from yours, because I'm very possibly not looking for the same thing in a game. A Landcruiser is a wonderful car, a Porsche is a wonderful car too, but they are not interchangeable depending on where you want to drive them if it's not simple roads. One will perform better than the other in its favoured environment, that's all.
So, how is this not a perfectly good explanation of 4e warlords? I mean, Martial IS a POWER SOURCE, not just "the ordinary mundane non-magical world."
And again, I'm all for it, but my reproach, explained many times now, is that if it's a different power source because it's not magical, make it brilliantly so rather than saying that it's a mish mash of magical/divine. Once more, look at the Wheel of Time, the Flame and the Void / Oneness, it's a martial power source that is brilliant in itself and creates unbelievably cool scenes, but it does not try to mimic the One Power, and the other way around.
IMHO this is why 'Chi' was not really an acceptable concept for a power source, and was rejected by the developers (I understand the cultural part too, not getting into that). Martial IS CHI. It is just a less stereotyped and 'Asian' presentation. In my own game, which uses pretty similar power source concepts, this is explicitly spelled out, "Martial is also sometimes known by terms such as Qi/Chi, ..." I mean, maybe there really isn't a perfectly good mapping there, but its at least a solidly supportable position. Nobody would argue with a description of a hero mustering his Chi and magically bolstering an ally with it. Heck, this kind of thing is practically stock-in-trade in half of all shows on Chinese TV in the last 20 years. You cannot even throw a rock online and not hit some video filled with that stuff.
And I'm all for it, just give it its individuality, don't make it different by just saying "It's different", make it really different, with effects which are logical and just different. Don't give it exactly the same power as arcane and divine, just by changing "divine" into "inspiring" in the name of the power.