On the ledge the vrykul warriors are always sparring, being instructed in the finer arts of battle by their thane's men.
I want you to take this flag and issue a challenge to a number of them. Let's demoralize them with the 'mere' skills of a <race>, shall we?
<The duke grins, his rotting teeth flashing in the dim light of the vault.>
Perhaps you could go back and challenge a few more?
Already I'm hearing reports of the prowess you displayed on the Savage Ledge. Excellent, <name>... excellent!
<The duke flashes his rictus smile again and you can almost hear the wheels in his head turning.>
And now I think it's time to issue a decree to the thane of those vrykul that you so easily defeated.
To get credit, target a vrykul, dueling or not. Get within range then drop the flag on top of him. If the targeted vrykul has a sparring partner, it will despawn.