speaking of potioning up, there are really a few factors to account for in a duel... namely how prepared are you and how prepared is the other person.. are you going into a fight with no potions and just your selfbuffs? are they going in with potions, healthstones, bandages, full selfbuffs, buffs from other players, and/or potions and scrolls?
To give you a scenario, when I just turned 40, I came across a flagged dwarf hunter and nE druid.. hunter was 38 and druid was 37. I think I had my voidwalker out at the time.. well, I cast Demon Armor and just went in it with them. They were expecting it because they were firing off buffs left and right also.. (PvE server). I got the hunter down to about 1/4 health, never touched the druid, and died... yay...
but that got me thinking... so I rezzed, rested, ate some food and got Well Fed, buffed with demon armor, created a healthstone, and called out my imp... not really a huge difference.. just a healthstone (500 HP) and an imp and like 300 more HP after well fed and blood pact... but it made all the difference in the world... took the hunter out with like maybe 1/3 of my HP left (after healthstone) and then took out the druid barely taking a tick on that (though at about 2/3 health she went into panic mode). oh, and obviously I forgot to mention the hunter's pet tiger in there.. so it was 3 against 2...
anyway, the point behind it all is how prepared are you.. no I don't mean do you have all of your buffs up... I mean are you really prepared? do you have some bandages, potions, a healthstone, if you are a pet user do you have your PvP pet out, do you have all long duration potions or scrolls up, etc.... because if you don't and the other person does... well, I would hardly call that a good representation of a one on one fight.