There's so much in this chapter. Firstly prudent reasoning from Carwin vs religious enthusiasm indirectly clashes in this emotion heated scene. Carwin has confessed his sins. Wieland escaped prison again to sacrifice Clara in his belief that the voice he hears is a divine messenger. Clara had thought of commiting suicide before Carwin's confessions, but once Wieland appears, she dreads the thought of dieing.
The atmosphere has such eerie gothic elements.
On the other hand there's a lot of character development, all 3 have changed a lot which makes them dynamic characters. Carwin seeks to clear up everything he had done out of guilt. Wieland had gone insane. But the most dramatic change is within Clara, who everyone adored, percieved as pure, brave and just and now - even though she just heard from Carwin that he had not made Wieland murder his family, Clara turns on him with a lie, a religious reasoning to save herself from her brother and to make his brother realize that "the divine messenger" is unreal. Clara is trying to use a possibly deadly trick on the two men. All three characters has reached a big turning point.