I always though The Under Empire upgrade from skaven would be triggered after scoring ruined region. But from the FAQ it seems it will be triggered after checking for ruination and ruiners score but BEFORE scoring ruined region.
Is this really the way it is? Then the upgrade seems not as good as I thought.
Yes, you score for the bonus and then have the option to leave before the actual scoring takes place. You can exploit this in a couple ways:
1) Stay where you are if you can sneak 1st or 2nd place.
2) Leave just enough rats behind to sneak 1st or 2nd place and move the excess off to other regions.
3) Move everyone to another region to get those bonus points as well and possibly get in on that scoring or move again from there.
So you don't have the ability to score a region fully and then move those rats to score another. But you do have the ability to pick up as many bonuses as you can and manipulate the final scoring in what ergions you can.