What is the right of the pledgor (Rahin) when the pledgee (Muir) releases the pledge and pays off the debt with the pledgor's permission?

Primary text

When the pledgee releases the pledge and pays the debt owed by the pledgor with the pledgor's permission, the pledgee has the right to recourse against the pledgor for the amount paid. If the pledgee pays the debt voluntarily without permission, the pledgee receives no recourse.