HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

I think a "normal" passage, where 50+% of the time, has 2 or more guards. The passage can be not only wide but also divided into two/three, and each will have its own guard, although the passage is essentially only one.

And in 95% of cases, you can defeat one guard and pass through, which cannot be done with a passage to the dungeon. The moral of this story is that normal passages are normal passages, a descent into the dungeon is a descent into the dungeon, two-way passages are two-way passages, and one-way passages are one-way passages, and IMHO, it is not worth equating one with the other.