Unfortunately, the figure of the saint on the south face is badly damaged, but the grill is unmistakable. Saint Lawrence was martyred on a grill, so this element identifies the scene.
The martyrdom of Saint Lawrence is non-Biblical.

East View: Figure with bellows, nimbate blessing figure.	South View: Lawrence on the grill. This view identifies the capital.
West View: Figure with bellows, nimbate blessing figure.	North View: Seated figure and city gate.

Related capitals:

Martyr Capitals:
Capital 1: John the Baptist Capital 6: Stephen
Capital 20: Peter and Paul
Capital 35: Saturnin (Sernin)
Capital 37: Fructuosis, Eulogius, and Augurius

Non-Biblical Capitals:
Capital 20: Martyrdom of Peter and Paul
Capital 35: Martyrdom of Sernin
Capital 37: Martyrdom of Fructuosis, Eulogius, and Augurius
Capital 42: Miracles of Benedict
Capital 49: Crusaders before Jerusalem
Capital 54: Miracles of Martin
Capital 75: Ascension of Alexander