Gokula’s Wonder, Kṛṣṇa’s Bhakta-vaśyatā, the Move to Vṛndāvana, and the Slaying of Vatsāsura and Bakāsura
कदाचिद् यमुनातीरे वत्सांश्चारयतो: स्वकै: । वयस्यै: कृष्णबलयोर्जिघांसुर्दैत्य आगमत् ॥ ४१ ॥
kadācid yamunā-tīre vatsāṁś cārayatoḥ svakaiḥ vayasyaiḥ kṛṣṇa-balayor jighāṁsur daitya āgamat
One day, as Rāma and Kṛṣṇa, with their companions, were tending the calves on the bank of the Yamunā, another demon came there, intent on killing Them.
This verse describes how, even during Kṛṣṇa’s simple cowherd pastime on the Yamunā’s bank, a demon comes with the intention to kill Him—highlighting the repeated asuric opposition to the Lord’s Vraja-līlā.
To set the scene of Kṛṣṇa’s innocent pastoral pastime and then contrast it with the demon’s violent intent, showing how the Lord protects His friends and destroys threats to Vraja.
A devotee continues simple, sincere devotional life despite disturbances, trusting that remembrance of Kṛṣṇa and steady bhakti bring inner protection and clarity amid “demonic” obstacles like fear, envy, and hostility.