How does the trait "Backtracker" work?

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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?
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