For Co-op Campaigns, Wouldn't the Quest Battle of Malekith vs Tyrion be awkward if you Co-op with the High Elves as Dark Elves?

How would this work?

Or do Co-op campaigns not have the end game quest battles and that was the end game quest battle?

If that was a quest battle for an item then it would be pretty awkward to fight your 'ally' wouldn't it?