yeah that was a passive skill, its a passive skill you need in order to get that skill for phsycopath form i think it was..well i forgot but look in that tree and look for passive skill.hope that is what troubled you i had the same problem i just re-specced since it was annoying and tried to get wraith form instead
naw, i love overdrive, if you have psychopath form then it won't matter weather or not you have overdrive, in fact it's worth having it to get psycho form