Unfortunately for Mzlateslavsky, "Gregor" (disguised as a Jew) goes to Pulichev to scout his opponent. While talking to Mendele, the two discuss their pasts and eventually realize the truth - that they are father and son. Together, they hatch a plan to expose Mzlateslavsky at the debate. At the debate, "Gregor" announces what has happened and begs the Cardinal to spare the Jews of Krakow. Mzlateslavsky is disgraced and the Cardinal, calling the incident a manifestation of divine providence cancels the order of expulsion. Shloime and Mendel then return to Pulichev as father and son.