I advise people not to ever join a server that is Pro in duel unless they trust the person hosting it.
There are some jokers going around (at least one) who will kick you in the last minute if you're beating them and it comes up as a win for them.
I looked at his history and he keeps doing this. He is an awful player and yet started cursing like a maniac when I was destroying him, I kept silent and then he waited until almost the last minute and then kicked me.
It shouldn't be possible to kick players in game. 99% of the time this is abused. I have seen very few cheaters recently, the policy of banning them on sight is working.
I suppose this is not even against the rules and he will continue to do this to other unsuspecting people?