It probably is a translation error, because Golagros himself said he only abducted Teta because he needed a way out and he thought Teta was a Beoulve so he could use her as a shield. And about Zalbag ordering Algus to kill her. I believe Zalbag was directly ordered by Dycedarg to kill Teta, because there doesn't seem to be any other way he'd do it. Zalbag was a very kind person, and he treated Teta like a sister. However, until he learned that Dycedarg had killed his father, he had extreme loyalty to him. If Dycedarg didn't order him to do it, I don't believe he would have done it.