The young Isaac's head is pressed against the side of a figure holding him by the hair. This detail refers to a scene that is very common in religious iconography. Although the depiction is very fragmentary, the presence of a hand holding a juvenile figure by the hair allowed for the identification and comparison with another fragment of a head.
This iconography can also be found, for example, at the portal of the Sainte-Marie Abbey of Souillac, around 1140:
