Benedick and Beatrice, Act IV, scene i
Excerpt for the scene summary: Benedick, trying to comfort Beatrice, asks if there is any way he can show his friendship to her. He suddenly confesses that he is in love with her, acknowledging how strange it is for his affections to reverse so suddenly, and she, equally startled and confused, replies in similar terms. But when Benedick says that he will do anything for Beatrice, she asks him to kill his friend Claudio. The shocked Benedick refuses. Angry, Beatrice denounces Claudio’s savagery, saying that if she were a man she would kill him herself for his slander of her cousin and the cruelty of his trick. After listening to her, Benedick changes his mind and soberly agrees to challenge Claudio—for the wrong that he has done to Hero and for Beatrice’s sake.
Link to the full summary and the information source: SparkNotes, "Much Ado about Nothing" - http://www.sparknotes.com/shakespeare/muchado/section8.rhtml
Image Source: Circulating Collection, Print and Picture Collection, Free Library of Philadelphia. Subject: "Much Ado About Nothing" – Shakespeare.
Original image source: Engraved by W. Ridgway from a painting by J.L. Watson, Cassell, Petter & Galpin