Wicca Rule of Three. These witches are in for a bumpy broom ride (May as well turn their faux religion right back on them).
I have watched documentaries where witches explain what happens when they have tried to attack a christian believer. The demons they sent out were deprived of attacking, and they came back pissed to the witch who sent them out and attacked them instead.
Not gonna be a pretty sight if these people are genuine witches.
You would think they know this. Its why many dont do malicious things to others.