Describe Stella's mental state at the beginning of Scene 4. Describe Blanche's.

Blanche is afraid for her sister and worried that Stanley has been abusive. When Blanche fearfully returns to the apartment, she finds her sister luxuriating in bed. Blanche had spent the night worried sick about Stella, but the conflict of the previous night was forgotten by its participants as soon as they were back in each other's arms. Stella admits that she is rather thrilled by Stanley's violent streak, and Blanche is horrified.