LostSoul said:Why would the fictional universe you're creating know something that you don't want it to know?
Because the people who live in that universe know 'the rules' -- they can observe them -- and I expect them to apply that knowledge in their daily life and act appropriately.
That's why a wizard spend 100K gold on a golem to guard his treasure, instead of 20 gold on elite soldiers -- because he knows that a band of four unlikely heroes can make short work of any mercenaries.
If you have abilities which 'work' when you're fighting something, and not when you don't, everyone in the world knows this -- they might not know WHY, they might not CARE, but they know it's true, and they'll take advantage of it. If only "PC" dwarves get the dwarven ability to heal as a minor action, young dwarves will be forced into brutal tests and their ability to recover timed -- the ones who recover fast will be marked as potential clan heroes and given further training.
Whatever the definition of an 'encounter' might be, it will, given the age of civilization in most gaming worlds, be discovered, defined, and exploited. If the players know they can keep an 'encounter' buff going by continually fighting, so will the people in the world, and they'll act accordingly.