That's just way too OP. Given they have such OP witches working for them, how has the ERO (Evil Religious Organisation) been struggling all this time? Given that most of their enemies up til now hadn't had the help of witches, they could have performed decapitation strikes with either these two or the one that was killed by Nightingale.
Disappointing, but maybe a spark of her is left behind unassimilated and will be able to help her brother survive.
If this is the kind of home I see Then I think mom will be near a window looking at them and she will turn and the sunshine will make the background so shiny it would look like she is a queen ( I hope she is a milf )