At a masked ball, various romantic liaisons are made. André and Christine declare their love for each other and plan to run away together. Marceau pursues Lisette, and the jealous Schumacher is upset. Robert and André come to an argument over Christine. In the secluded greenhouse, Octave declares that he too loves Christinewho is now having doubts about Andréand they decide to run away together. Schumacher and Marceau, who have both been expelled from the estate by Robert after a fight over Lisette, watch Octave and Christine in the greenhouse. As in Beaumarchais's "Marriage of Figaro," the literary basis for Mozart's opera, they mistake Christine for Lisette because Christine is wearing Lisette's cape and hood. Octave returns to the house for his coat and hat, where Lisette begs him not to leave with Christine.