Talking to my players, we found that retreat doesn’t happen nearly often enough. Now the reasons are varied, but one thing we all sort of agreed on is that new players often don’t realize that it’s even an option.
Thus, this little video. Let me know what you think!
Another thing that contributes to that accidental teaching not to run away is that many powerful creatures are too fast to run away from. When going through the most threatening enemies i had faced in Pathfinder, all of them were faster than my character, even though it had a feat that increased speed. The narrow passage is one good solution for those cases, though it might feel contrived if used too often.