My pc hits your pc for 5hp of damage. What happened in the fiction?
Ten rounds ago when Heliax the Enduring had 120, your blade has either slipped past his dodging, parrying, and/or armor to cut slightly, or maybe bruise him, or perhaps tire him a bit, or maybe spend some amount of fortune's smiles that he had acrued - the lens is cloudy who can say - but in any case death has moved a tiny bit closer.
Five rounds ago when he had been at 65, your stroke bruises, cuts, strains, or taxes him - the scene is obscured so which is hard to tell. In any case some would now remark he is "bloodied" (in the vernacular of the land), that is, half-way to death, even if no blood has necessarily been shed.
Three rounds ago your blade again did enough to task his endurance and brawn and resistance and body, in spite of armor and parrying and dodging - there is a fog of battle, it is hard to be sure which and how - so that he is now much closer to death at ten than the fifteen of a moment ago. He should have been frantically shouting for the cleric before now I think.
With your swing last round he fell to the ground, worn by want of endurance, bruises, loss of blood, lack of will, and/or being devoid of luck - who can say which combination in this maelstrom of flickering blades - and lies unconscious.
And now, with your last swing, he dies. Who can say in the aftermath if it was a cut, a stab, or a pommel strike. It matters little to what was once Heliax the mighty.
My pc missed you with an attack. What happened in the fiction?
Your attack either missed in a way that spent no luck or tired him not at all, or struck his armor to no affect, or was parried - the lens is smudged, it's hard to tell on the screen - but no harm of any sort to note has occurred - even if one were hyper-attuned to noting such things, or even omniscient.
If the picture cannot actually tell you anything about what happened, it’s not a simulation.
Lack of precision is not nothing. A full day weather forecast instead of an hourly one is still more information than no weather forecast.