Rage quitter report. I don't think that is necessary if there are a few adjustments.
Anyway quitters shoot themselves in the foot loosing still gives you 250 gold and 25exp quitting/leaving gives you nothing so it's just waisted time.
But it's much worse for the opponent:
The first time you get your exp and ress but in other battles you get nothing. And thats what it makes annoying your enemy plays until he is 1 round away from loose and then leaves (I had that yesterday 4 times
I can understand that you don't want to play against someone 4 levels higher especially if you have no chance.
Coming to the point:If the same opponent leaves more then 1 time the winner should still be compensated in future leaves of this opponent.
Maybe with 500 gold + 50exp or better depending on the battle length