Shadow Freddy and Shadow Bonnie.

A line in UCN seems to tell me about the relationship between Shadow Freddy and Shadow Bonnie.

"the Shadow fears me!"

This implies that Shadow Bonnie is actually scared of Shadow Freddy (aka Nightmare), the one who spoke that line.

Now let's rewind back to FNaF 3. In the FNaF 3 EON minigame we can see SB standing in clue corridor yet he isn't doing anything.

Could it be because he is simply scared of SF and because of that chooses to not intervene?