Game Mechanics: SRo Pathing

[Handull]

This might just be the standard pathing issue bug that appears all over, but since I've never fought in South Ro before it is new to me there. I was fighting a Zombie and sudden it vanished, but what still hitting me. I was either too far away to attack it or I couldn't see it. This happened on the hill that is usually camped for the Ancient Cyclops. I'm not sure if I was standing still or not when the mob vanished. I'm guessing it fell through the floor, though not really sure. Just posting this in case it helps anything. Luckily I was able to zone in time and didn't have to petition in game.