PVP bug

I was doing some pvp today and i noticed that there are some bugs that allows to 2v1.I seen like 3 times today in heiron 2 against 1.
And when i wanted to duel someone it was another one who was dueling him at the same time for a moment and tell when i tried to kill the one i was dueling i couldnt use any skill and he had infinite life

Frist photo of the duel:



When he had no health:





And this after 5 min when i was posting this on forum and i could still attack him:





The weird thing is that i can still attack him

 

Flying out to DP entrance should solve and "PVP" issues you may have.