The Method of Reconciling the Report of 'Umar with Li'an

Question:
May Allah reward you. He says in the report that 'Umar (may Allah be pleased with him) was asked to adjudicate a case where a man found another man with his wife and killed him. The blood relatives of the victim demanded retaliation (qisas). The man defended himself by saying that he had found him with his wife. 'Umar asked the blood relatives for details: "Is this true?" They said, "Yes." So 'Umar approved the man's action and said, "If they return, he may return [to killing them]." What is the method of reconciling this report with li'an? May Allah reward you.

Answer:
This is not from the category of false accusation (qadhf) such that it would lead to li'an or shurud. This is defending his honor; he is defending his honor. And when a person is attacked in terms of his honor, he has the right to repel the attacker, even by killing him. This is from the category of repelling the questioner. Yes.