तेजसा मणिना हीनं शिबिरान्निरयापयत् ॥ ५६ ॥
tejasā maṇinā hīnaṁ
He [Aśvatthāmā] had already lost his bodily luster due to infanticide, and now, moreover, having lost the jewel from his head, he lost even more strength. Thus he was unbound and driven out of the camp.
Thus being insulted, the humiliated Aśvatthāmā was simultaneously killed and not killed by the intelligence of Lord Kṛṣṇa and Arjuna.