Joint Technique Training for Assassin

[Vogreine]

I did the Joint Technique Training for Assassin in both classes and managed to do all of them except the Daze one. I tried several times and the boss says "Resisted". I asked some other assassins on the server to try it out and they said it wasn't working aswell. 

And yes, I know how it works. 

It's the level 25 training. The 3rd one.