Due to this fact, Morocco hires Despara to assassinate Roya. Because Roya's mother had joined bodies with Despara right before her death - as a result of her protecting Roya - Morocco could never look Despara in the face without being thrown into fear as to look at his own wife's face.
Due to this situation, Morocco employs Despara to murder Roya. The fact that Despara's mother had merged with Roya before her death, in order to safeguard her, prevents Morocco from confronting Despara without experiencing extreme fear, as he would be forced to behold the visage of his own spouse.