Prisoners at a state penitentiary took several prison staff members as hostages during a riot at the prison. Following negotiations, the prison warden signed a written agreement, agreeing that the prisoners will not be punished, if they released the hostages unharmed. After the hostages were released, the warden punished the prisoners involved in the hostage taking. Do you think that the warden contractually obligated to honor the agreement? Why or why not?