Śrīmad-Bhāgavatam 10.12.28
Blended reading (Sanskrit + English inline)
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kṛtyam
—
what is to be done
From kṛ- (to do). The technical word for required action — duty, the right next move. Kṛṣṇa is shown deliberating like a competent agent. Gauḍīyas read this as līlā-deliberation; the Lord 'considers' though He knows.
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khalasya jīvanam
—
the life of the wicked one
Compound: khala (wicked) + jīvana (life). Aghāsura's death is named as the first half of the problem. Bhāgavatam is unflinching: killing a demon is a legitimate divine action.
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satām vihiṁsanam
—
harm to the devotees
Compound: sat (devotee, truth-keeper) + vihiṁsana (harm). The second half. Kṛṣṇa names the protection of the devotees in the same breath as the killing of the demon — both are equally divine work.
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aviśat tuṇḍam
—
He entered the mouth
Compound verb: aviśat (entered) + tuṇḍam (mouth). The pivot of the chapter. Gauḍīyas: Bhagavān's entering the mouth of His own destroyer is the structural pattern of avatāra-līlā — the Lord walks into the very throat of evil to undo it from inside.
Kṛṣṇa is known as ananta-vīrya-sarvajña because everything is known to Him. Because He knows everything perfectly well, it was not difficult for Him to find a means by which He could save the boys and at the same time kill the demon. Thus He also decided to enter the demon’s mouth.
What should I do in this dangerous situation? How can I at once kill the demon without harming the boys? Thinking in this way, and finding a solution, he entered the mouth of the serpent, because he is one who knows what to do in the present and future (asesa drk) and he takes away (hari) danger (for the devotee) and life (for the demon).
How to do both simultaneously? Thinking about this and understanding the solution, the attractive Lord who saw the perfect method entered the mouth of Aghāsura. Kṛṣṇa saw the perfect way (aśeṣa-dṛk) to enjoy pastimes and liberate the demon, to protect the devotees and destroy the rascals. Or he saw the unlimited calves and boys. He then entered the snake because he was overcome with affection by seeing their condition. He is called Hari because he would remove their suffering and attract their minds.
Picture a master craftsman with two jobs that look mutually exclusive: save the friends already inside, and kill the killer who contains them. Lesser problem-solvers would sacrifice one for the other. Kṛṣṇa, being unlimited, waits for the cleaner solution — He enters the same mouth, and from inside accomplishes both. Bhakti's lesson: the Lord does not trade His devotees for His justice.
Prahlāda Mahārāja (SB 7.5) was thrown into fire, poison, off cliffs, and into the coils of serpents — and each time emerged unharmed because Bhagavān protected him from inside whatever danger was meant to consume him. Hiraṇyakaśipu, like Aghāsura, found that the trap he set turned into the chamber of his own destruction.
Gauḍīyas read both episodes through the same lens: Bhagavān saves the devotee not by removing the danger but by entering it. The cowherd boys in 10.12 walk into the python; the Person they belong to walks in after them and exits with them.
My note
Source: vedabase.io