I think this skill ain't working properly, and if it works, it must be like 1% chance in both players and monsters.
I encourage Pandora or any other GM to test this skill and notice that it doesn't work. I mean, when it works the effect works, but the success chance is like...
I went outside Prontera and used it on a Lunatic and used the skill 40 times, always skill failed.
I also tested it in players and it does work, but at a very very very very very very very very very very very very small chance.