I did it 3 times to make sure that I didn't did anything wrong and it still did not complete my quest.(I did the 300 light version of the strike)
Yes, I killed them within 30 seconds of each other.
Yes, I killed the sword guy before Alak-Hul
Yes, I killed the sword guy that matched my sword (Arc Blade, so I killed the Arc-shield-dude)
And yes, I killed them with my sword.
The queest log shows something around the lines of
"[i]Complete[/i] Kill Thracu, Carcerer of Oryx"
"Kill Alak-Hul, the Dark Blade"
Anyone has any idea of why it didn't complete? Please, I really don't have time to do this stike again.
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We did this twice 2 days ago. Keep the arc knight alive until Darkblade is almost dead. Whack the arc knight, then whack the Darkblade. Not sure of the time limit, just do this as fast as possible after you kill the arc knight. Sounds like you got the steps, don't know why it's not working for you.