He was arrested by Arjuna, and he was to be killed. Kṛṣṇa ordered that, "Kill him. He is not a brāhmin. He is less than śūdra." So when he was arrested, then he was let loose by the request of Draupadī that, "I am suffering for the death of my sons, and this rascal is the son of our Guru Mahārāja, Droṇācārya, who has done so much for us. If he dies also, then mother guru will be very much unhappy. So let him go away." So, being insulted, he threw atom bomb, brahmāstra. The brahmāstra is something like atomic weapon, nuclear weapon. It can go to the enemy wherever the enemy is. It doesn't matter. It will go and kill. That is called brahmāstra. So the brahmāstra was . . . he knew that, "The rest of the Kuru family is Parīkṣit, the son of Abhimanyu. She (he) is in the womb of Uttarā. So let me kill him also. Then everything finished." So drauṇy-astra.
So when that weapon was let loose, Parīkṣit Mahārāja mother, Uttarā, felt that she is going to discharge the womb. And she approached Kṛṣṇa, "Save me." And Kṛṣṇa entered the womb of Uttarā and saved the child, the posthumous child. So in this way the Pāṇḍava families was saved. Simply Parīkṣit Mahārāja remained. That also within the womb of his mother.