Yeah, whatever you say, but don't forget, it says: "You need to be able to kill 2 PPLV members on foot." The duel word not even shown.
And Arash, believe me, it was quite hard to kill him even if he was civ. Evading he's chainsaw wasn't a peace of cake.
Search for HasmA, I hate him too, I'd like him to be one of my victims killed by a flying vehicle. 
The word "duel" is not included because those tests were set
before the duel arena system was put in to place by PTP.
Since it has been implemented, we are making the most of it and insist that that test is done in the arena.