How does the trait "Backtracker" work?

In The Darkest Dungeon there is a trait named "Backtracker" with the following description:

No Stress penalty when walking backwards

Does this refer to literally walking backwards within a hallway after having walked forward? (by pressing A)

Or does this refer to entering and passing through a hallway again that you went through before?

Also, which of these result in additional stress, as the trait description implies?

Solution 1:

Both the Backtracker trait and the additional stress penalty refer to walking backwards within a hallway after having walked forward. I couldn't find an official source for this, but it's relatively easy to verify manually that walking backwards through an entire area causes more stress than exiting, reentering, and walking forwards in the opposite direction. (If you want to verify this, I recommend using throwaway characters)