У вашего броузера проблема в совместимости с HTML5
Aquamarine
Lv50 Maverick/ Lv50 Knight
IGN: Jikan
Apparently animation cancelling in duels sometimes bugs the opponents screen rendering them unable to attack due to "the target being out of range" and with a certain amount of movement speed, it may also allow them to see you teleporting. Ranged classes and ranged skills however are unaffected by this bug.
You are still able to attack but only when the opponent is running back towards you to be within range of your attacks. For classes that kite differently such as Hunters or Engineers, meaning they animation cancel while moving away from you, you would have to run a fair distance until your character appears to be ahead of them to be able to attack them. If they juke you, then tough luck :/... keep trying.
Random dueling in Aven Ch1.