NPC's that were frequently killed (such as guards, trolls, dagannoths, and Pest Control monsters) commonly suffered from this glitch. Attacking the affected monster would engage it in normal combat. However, the player could walk away from where the affected monster appeared to be during the fight. This was because the monster was actually walking around, but the glitch prevented the player from seeing where it really was. As a result, the player would approach and fight the monster on its actual position within the RuneScape server, even if it did not appear at that position for the player.