O brahmana, as soon as Kṛṣṇa sat upon his chariot and was about to start towards Dvārakā he saw panic stricken Uttarā coming towards him.
Uttarā is the wife of Abhimanyu (son of Arjuna & Kṛṣṇa’s sister, Subhadra), future mother of Parīkṣit.
Dvārakā is Kṛṣṇa’s own city.
Protect me! Protect me great mystic; god of gods, and protector of the universe! I see no one but you who can drive away my fear in this world of repeated death! My powerful lord, a blazing metallic ray advances upon me! It can burn me, master, but don’t let it harm the baby in my womb!
The All-Attractive, ever affectionate towards the devoted, heard her words and understood that Droṇa’s son had sent forth this weapon to finish the Pāṇḍava dynasty.
O best of scholars, seeing a blaze coming their way the five Pāṇḍava brothers took up their five weapons.
Seeing that he was their only hope of being saved from this danger, the Great One took up his own weapon, the Sudarśan Disc, which protects his people. He is the soul within the soul of all living beings, so Hari, the master of all mysticism, used his own mystical power to shield the womb of the daughter of Virāṭ and save the Kuru dynasty. Even though the ultimate weapon is unstoppable and inescapable, when confronted by the power of Viṣṇu it was neutralized. Don’t think this is impossible! All impossibilities reside within the Infallible! By his divine mysticism everything is created, maintained and destroyed.
Aśvatthāmā, Droṇa’s son, is the same vile man who decapitated the five sleeping sons of the Pāṇḍavas and then recklessly let loose an uncontrolled nuclear-like explosion in a last-ditch attempt to save his own skin. The Pāṇḍava’s spared his life and let him go with a mere reprimand. His contemptible spirit did not reform, however. He brooded constantly on how to destroy the royal family who had defeated and humiliated him.
He knew it would be impossible while Kṛṣṇa remained nearby, so he waited and waited for Hari to depart. He saw an ideal opportunity the moment Kṛṣṇa began to leave – for all the Pāṇḍava men and their unborn child were together in the same place. In a passionate haste this despicable wretch again sent forth the ultimate weapon in an uncontrolled blast.
Uttarā saw the approaching weapon first and turned, panic-stricken, to Kṛṣṇa for help. The Pāṇḍava’s instinctively reached for their own weapons, but Kṛṣṇa knew that such weapons were useless now, and there was no time for any other approach. So he took up his own weapon, the great discus of Viṣṇu which drew the perilous blast into its vortex and neutralized it. This saved the Pāṇḍavas, but an unborn child is very sensitive and easily injured. To give special protection to this child in Uttarā’s womb, Kṛṣṇa used his mystical power – which is within every atom as the soul of every soul – to form a shield around the womb and absorb the radiation from the blast.
To us, the entire story is fantastic. But to the sages hearing this story from Sūta, many of the details were contemporary and immediately real. The powerful weapons of ancient warriors, for example, were practical realities to them. So gestures of disbelief showed on some of their faces. “That weapon is unstoppable except by another instance of itself! How could it have suddenly been dispelled, and even a fetus was not injured in the blast!?”
Sūta politely reprimanded their disbelief by reminding them that Kṛṣṇa is Viṣṇu, not another ordinary warrior. Nothing is impossible for Viṣṇu’s magic to destroy, because by this magic the entire universe (what to speak of a comparatively miniscule explosion within it) is destroyed, and created and maintained as well.
Now we have been introduced for the first time to Parīkṣit, the person to whom and for whom this book Śrīmad Bhāgavatam was spoken. We are introduced to a person who was protected and embraced by Kṛṣṇa while he was still in the womb.