In ToB I left Saradush then did Watcher's Keep and Neera's quest. When I try to leave the clearing at the end of Neera's quest for any other area I get waylaid by four Crusaders and the Planetar of Justice who are looking for Dorn. I have tried everything I can think of but the Planetar is unkillable. Its status goes to Near Death and I continue to see damage done to it but it will not die. Am I missing something or is this a bug?