That's interesting in that - as far as I understand - the witchfinder's thought that witches were not evil incarnate, as far as I understand, but somewhat possessed and that there would be some ceremony mourning the dead woman and praising that she had been cleansed and is at peace. As far as I understand. This might be slightly off but I seem to remember this coming from Carl Sagan's book or maybe it was some folksong about burning witches for their own good.
I'm pretty sure that the Malleus Maleficarum goes on at length about how witches ARE evil, and in fact more evil than any other form of heresy. See a whole half of the 2nd chapter for example. It goes at length about how while other heretics don't (necessarily) have some explicit compact with the devil, witches did enter an agreement with the devil and are all about opposing God and defiling his creation.
That said, burning witches was often rationalized as for their own good, and some form of purification so they may get to heavens. Not surprising either. As I was saying, it was a massive campaign of terror, and of unprecedented cruelty. It created massive revulsion in the population as it is, so you had to rationalize it SOMEHOW so those people don't just run you through and free the witch.
By the time the mania went over the peak and public opinion was forcing a gradual reduction, they even rationalized it as, I kid you not, that the Devil anesthetizes the witches while they're burned. And, you know, they're just screaming a bit for show, nothing more.
And by unprecedented terror and cruelty, I really mean that. While being put on a pile of burning wood was horrible as it is, a LOT of people basically looked at some women screaming in agony for up to an hour and went "bah, it sucks, it barely took just under an hour to die." And proceeded to find ways to make it more horrible.
E.g., a thing they discovered fairly early was that they could tie the condemned to a massive stone pillar, that takes very long to heat up, so they're only cooked from one side. Suspending someone OVER the fire was used in excesses like those of Savonarola, though those for accusations of heresy rather than witchcraft. (Incidentally, he shows the danger of going overboard, as eventually he gets a taste of his own medicine.) Piling the wood around the accused at a small distance instead of under him/her also was used.
But then came the smart cookies who figured out they can essentially bake someone in an oven, to make it last longer. (Plus the sensory deprivation part when being put in a dark oven.) In France and Spain they built quite a bunch of those. And in Germany, the scene in Hansel and Grettel where the
godless witch is thrown into the oven and screams horribly, or for that matter that they felt a need to throw a "godless" in there, is sometimes hypothesised to have been inspired by such an execution.
Which I guess also had the "nice" side effect of having some permanent structures dedicated to burning people alive, to remind the population of the threat in between actually getting around to burning someone.
So, yes, plenty of horror to go around. You had to go just enough overboard to keep the population scared witless, but rationalize and handwave it enough so they still go with it instead of throwing you into your own oven.