Archers vs outsiders split from unfairly powerful monsters

[Beheld]

As a more general comment, I would like to say that I built Carry the Commoner with the intention of fighting a single monster (a Pit Fiend) in an arena battle.

Most arena fights I've seen forbid surprise rounds and teleporting out of the battlefield. That's why I didn't plan for them.

Most Arena's have nothing to do with actual gameplay, which involves a lot of going into peoples fortresses and murdering them on their turf and/or detection minigame ambushes.