Imo play the drain game, focus shaman til oom then switch and nuke warrior. I doubt you will do anywhere near the damage to kill the warrior without the shaman going oom unless they are very bad. CC warr, drain + dps shaman, kill all totems, bash/charge heals + cyclone on low hp. When hes like 10% mana and used ns just cc and switch to warr. Should be fairly easy
