The kills are speedy in that vid but thats just because the guy filming was a much higher level than the people he was massacring.
What I meant was in WoW, you move around a lot. You can only attack someone who is directly infront of you so people are CONSTANTLY trying to get behind each other. As a rogue you would constantly stun people, run behind them, backstab, spin 360 and blind the person behind you, spin again to finish of the other guy, sprint away, restealth, come back for the guy.
In all the WAR vids I've seen the two stand there and use moves untill one of them dies.