Destruction Warlock Dueling video.
Footage taken on Kel'Thuzad.
I am in no way, shape, or form trying to show skill since it is a Nightfall BG; how could you. The duels are entertaining to watch.
Also in game you'll see some Teleport exploits in BGs, and some Mammoth Harassment around Org. You'll see poorly editted clips.

Fight Order:
Sub Rogue
Ass Rogue
Arms War
Affl Warlock
UnHoly DK
Frost Mage
Destro Warlock
MM Hunter