Okay so once you send a duel request, The duel window pops up, If you try to cancel the request, the duel window STILL stays open until the player zones.
I think 5 seconds for the window to be open after the request is canceled is enough time for spamming not to be a problem.
Today, someone sent me a duel request, They figured I was AFK so they canceled the request and went AFK also, I accepted and beat them while they were still AFK :P
fix plz tnx