Yan Tuo and Jiang Baichuan was hostage. If they killed those fiend. LXR will get angry and can kill the hostage
I think(although I am not sure if it's the right explanation) that the bands she put on their ears and shock was to adjust them to high frequency similar to that from ghost whip, and that's in a sense giving them pain only. Coz they couldn't fight her back or tolerate that frequency.
(Again it's just my guess)