Agree (well, often a little beyond round 2, especially if there's an initial missile/spell exchange). RQ has this strong "death spiral" (once you start losing, you start losing more) which is usually considered a bad thing (as it means a battle is decided long before it's finished if everyone fights to the death) but works really well here, as it means that even if the sides were reasonably even at start, things will soon tilt in one direction and then it's time to try to get out of the fight for the losing side because catching up is really hard, and further supported by how there are institutions for not fighting to the bitter end.
Even if one side fights to the death, I like to call things once it's clearly decided ("You clear out the remaining rabble"), because rolling your way through the mopping-up is pretty boring and time-consuming. If they could handle 12 zombies, they can handle the remaining 3, unless they've been seriously weakened doing it.