Looked online to find how people were house ruling followers as the main book doesn’t really have npc vs. npc interaction.
This is straight from the game designer:
And this is another option I found online.
IF the die roll needed goes below 1 or above 20, the higher level NPC wins automatically.
I don’t care how you use your followers. You can even switch back and forth between these 2 mechanisms during gameplay.
We can still fiddle with this a bit if anybody wants to spend their xp to buy skills/etc for their followers.