Which gives us two options: do not kill the villain, or kill the villain and their entire family. See, I thought that the children all came from that very village and I expected the spell to be lifted as soon as the witch died.
In case it didn't though, seeing the parents stoning Madaura sparked the idea that the kids could end up hating their own parents, which was why I totally approved of Hakuryuu taking the initiative to kill her too. Then it turns out that the kids would have all gone son Sindria anyway..
I do feel slightly disappointed that Aladdin didn't disclose this discovery of Magnostadt having a hand in this. It would have given a more worldy feel to this arc and highlight the fact that they're brewing trouble all over the place.