It is a disorientation technique only used by Rogue. While it's a disorientating technique for opponent, it's also disorientating for the user. You can become accustomed to using this skill if after you use it many times though. The Rogue has Mirror OH weapon and the primary skill is swap. You "swap" places with your opponent or mirror image.. the damage is negligible but can confuse you if you think you are headed in a certain direction but are swapped with opponent. After you experience it a few times, it's an easy skill to defend.