A Multi player Qs for avp2 on the net

Ive played Multi player avp2Prim on the net and I love going the alien (predAlien mostly), and I found that I cant Stun with my tail and pounce attacks, Im finding it hard to keep up with the other races without this ablity,
Please can somone tell me what happend to it, because I can remember kicking ass a few years ago, Now I cant?