Fast forward to 2012, and I know better. The figure instead portrays the Sacrifice at Lystra. The New Testament (Acts 14:8–18) tells that when Paul and Barnabas visit Lystra, Paul heals a crippled man. The Lystrans believe the two apostles are Greek gods, and, to their horror, bring out bulls to sacrifice to them. Rafael’s sixteenth-century cartoon portraying the scene (commissioned for a tapestry for the Sistine Chapel) is the design source for the figure group. A similar Roman relief panel (now in the Louvre) showing preparation for the sacrifice at Lystra may have inspired Rafael’s work. Below is a 19th century bible engraving, and I suspect our potter used a similar one as a design source.
My thanks to Stephen Duckworth, whose specialty is Victorian religious figures, for correctly identifying this figure group.