The ritual of shadows question

By theundead, in Descent: Journeys in the Dark

At the end of the first encounter, what's the difference between if the overlord has 4 fatigue or 6 fatigue in his play area? moving 4 or 6 doesn't matter, since there's a door to block movement!

I would have to look at the quest guide, but are you sure the doors don't begin open?

Oh, you're right!

sorry about that!