Blocking "I had Barbara"

My favorite scene from the entire story of “Roman Fever” was the very ending when Mrs. Ansley walked towards the stairs to leave the terrace. She quickly turned to Mrs. Slade and said, “I had Barbara.” While this interaction is short, it’s the pinnacle of the entire story.

If I were to block the scene out for a play, I first want to make the lights dim as if the play were ending. Mrs. Ansley will look like she’s about to leave the terrace without saying a word, pause on the stairs, and then turn around with confidence (like she’s made an important decision). A spotlight will aim at the two women. I envision Mrs. Ansley just saying, “I had Barbara” in a normal voice without any emphasis on a specific word. (Just one flowed out sentence).

Mrs. Slade would initially be stunned at the statement as if confused. A few moments later, she’ll gasp and finally understand the meaning of the sentence. After Mrs. Slade realizes Mrs. Ansley’s statement, Mrs. Ansley’s will turn back around and exit backstage. The audience will be left with Mrs. Slade as she sits back down in shock realizing all her jabs at Mrs. Ansley were for nothing. Then, the lights will fade to black.