If the Gunbreaker had committed some injustice and used their position and abilities to escape punishment, the Dark Knight will win.

If the Dark Knight is attempting to intrude upon something or someone the Gunbreaker has sworn to protect, the Gunbreaker will win.

This isn't actually facetious: I strongly suspect that the motivations of the combatants matter a great deal. Especially for the Dark Knight, who is basically powered by their strong emotions, and from what we see in the questlines, become more powerful when they have something to truly fight for.