I've completed the "ice horn" quest, but according to the walkthrough the boss I just beat was supposed to steal both horns and then I'm supposed to chase him to the cave to the north. But I never saw him re-steal the horns and Iwhen I go to the northern cave there is a fire wall that blocks my path. I can't go any farther, and I've done everything I can on this level. I've re-visited all the places I've been before twice and I', getting frustrated. Any help is appreciated.