I think Lois'" marriage" to the chief is for her protection from the bad guys still looking for her. The Bangala may be remote,but they are not in complete isolation. Others, not so friendly, must know of the white woman in the mists. I dont know enough about how Lois was found, and what went down to insure her safty. Something has.Will the bad guys come after the chief's wife? I think some kind of trade or bargin was made by the chief for Lois'life. Or maybe not.
