Well, you need a fair bit of luck for them to never land a hit on their attacks since you didn't avoid them, but I did read the game info on counter attacks the other day, and it seems you have a chance of completely preempt enemy attacks with it if you're sufficiently superior (I've never used counterattack at any time). Still, it's lucky never to take a hit, and once you start doing so, everything goes downhill as the injury reduces your movement rate as well as your effective weapon skill. The you take another hit,...
Furthermore, you need a FAST character to keep enemies from catching up with you. At least 7, and probably 8 km/h.
At 8 km/h only the unarmored civilians were able to catch up with my Njerp killer Kaumo (a dozen or so villages before the inevitable death initiated by an unlucky injury followed by the downhill spiral).