44 One takes a blow on one's face only when one is absolutely helpless and powerless, otherwise until one has some power to resist, one goes on receiving the blows on the other parts of one's body but saves one's face. Therefore, here the extreme state of helplessness of a person has been depicted, saying that he will receive the severe punishment on his face.
45 The word kasab, in the Qur'anic terminology, implies one's descrying and earning a reward and punishment in consequence of one's actions and deeds. The real earning of a doer of good is that he becomes worthy of Allah's reward, and the earning of the evil-doer is the punishment that he will receive in the Hereafter.