perhaps they should implement a ranked duel mode, and none ranked duel mode.
that^ for example press F for ranked duel and press H for not ranked duel, i dont like that so called pros dont fight you because they are afraid to lose points or for example iw as fighting GK master cavalry yesterday on duel server (he is number 1 on duel list) and i dismount him after he misses me with his lance and guess what he disconencted even befor gettign up, looks like he practiced that action pretty much according speed he managed to do it. And ofcourse thing that panos said about knockdowns, only people who let me get up are those who i know very well and spend a lot of time playing together. I think duel server is meant to improve your 1 vs 1 skills, maybe train chambers or test some equipment, but not for e penis enlargement.
edit: i just thought about funny thing to implement

add count of disconnects during duels next to players name on duelers scoreboard

and guy with most disconnects gets tile , something like pussy of the year.