Greetings!
Well, indeed, Allanna was a contributor to the kidnapping of Julia. She was in fact responsible for luring Julia away from the encampment into a secluded area where Archerus then seduced her into his power.
The interrogations of Allanna were proceeding with mixed results, because while she is an important cohort to Archerus, the exact location of his inner sanctuary is a secret, from nearly everyone. Thus, she doesn't know precisely where his inner sanctuary is, and zones of truth and charming revealed only a little more than what she volunteered. From this, her usefulness had apparently begun to dwindle.
Having said that, I personally think that keeping her alive would have been better, tactically speaking.
Berenar's player explained that he felt that Allanna was guilty of Julia's murder, and keeping her alive a little while longer was merely a portion of restitution for her death, insanity, undeadness, or whatever, before being properly executed. The actual death of Julia in front of him merely hasted the righteous judgment. In addition, he really liked Julia, and was embittered at her death, and Allanna's smug attitude and snide little commentary about what her master was going to do to her. Thus, at that moment, his disgust and hatred of her and all she stands for reached a boiling point in representing his determination to root out evil and bring true liberty and righteousness to the world. That mission, in his eyes, would be strengthened and supported by the death and defeat of Archerus and Allanna.
Having heard that, and as MMADSEN and Dragonblade are both familiar with the paladins and the culture of the Vallorean Empire, I was natuarlly sympathetic. I'm still a little troubled by it, however, and am leaning toward maybe an atonement or something. I'm not sure. The character is saddened by Julia's loss, and has vowed to track Archerus and his minions down. Her loss is painful and sad, because his character was in love with her, and she was looking forward to having a family with him someday.
Semper Fidelis,
SHARK