how do the stage directions at the beginning of act four set the mood? what does the contrast between this setting and the one being described at the start of act one suggest about the changes brought about by the witch hunts?

The fourth act takes place in a Salem jail cell later in the fall. The mood is gloomy and depressing. Many people have been thrown in prison and await execution over lies created by a few girls. Act one begins in a small upper bedroom of the home of Reverend Samuel Parris, who kneels in prayer at the bed of his daughter, Betty. The story has gone from a "sick" girl to innocent people set to be executed.