@ Gal
THe movie's name was Pit and the Pendulum
THe reason that the "witches" were burnt, was that they didnt PRAY to heal people, they applied their OWN (in other words not the Church's) remedies.
What happened later in that movie, was that he DID bed her (rather violently), but she later broke free, turned his own sword on him, after husband (who was also thrown in prison) broke loose from the torture chamber, and helped her escape.
The evil priest got killed (like they always do in the movies).
