We've uncovered an issue with the Chumba Wumba encounter in the Volcano Dungeon, which is a part of the quest "Into the Fire."
When attempting to break Chumba Wumba's totems, we recommend you not use any powers (from either yourself or your companions) to destroy the Totems. Instead, please use only regular attacks against the totems as there is a possibility using a power against a totem will leave you in a state where you cannot win and will have to flee the dungeon to try again.
We're working on a solution to this issue and will be making an effort to correct this bug.
Sorry for the inconvenience and any trouble this may cause.