Backstab

Backstab  is an active skill usable and shared by all Slayers, Warriors and Valkyries. Ninja's Decoy Jutsu works similarly.

There are four versions of the skill:
 * Backstab (Slayer)
 * Backstab (Valkyrie)
 * Backstab (Warrior)

Common feature of skills is that it teleports player behind target and features iframe. However Slayer and Valkyrie skill immobilizes target, whereas Warrior's stuns the target. If skill is cast and no target found, it goes to cooldown with no effect.