I tried that, walking to the farther part of the map and the enemies were still blocking the way when I came back to check if they moved. I also stayed still away from them just to see if they move, but it's no use either. It seems all enemies on that level stay still once you fight them 2-3 times
they're set to escape from the hero direction after defeated. I guess if two of them got to the end of the corridor and the map doesn't have an area for you to manipulate their movement backwards, so you really may be stuck.
The best way to prevent this is probably just keeping more than one save, in case something like that happens.