The Chronicles of Sir McMac the Brave and his squire Squick

You’ve heard of GMless roleplaying games. 

Now, get ready for a playerless game.

You and at least one other take the role of Grand Masters (GM) at Windswept Abbey. You are tasked with preserving the deeds of Sir McMac the Brave (and his squire Squick) for the future.

The only problem, you cannot agree how events unfolded! And the Holy Book of answers got tossed in the laundry and is now useless.

Create the rules, arbitrate the rules, narrate the outcome. 

There are no players here to ruin your day (only other GMs).