Leona had hit her mark, still being attacked, but was easily able to counter attack as she drove her sword into the same cut on the void Reavers side
Kha'Zix managed to leap away in time, but stumbled when he landed. That cut had did some damage, but he would manage. He would just have to keep this going until she starts getting dizzy from the blood loss. He's surprised she hasn't gotten dizzy yet.