We have prevented him many a time and oft and still he persists in chanting the glories of our foe: it is proper to destroy the wicked boy at once". Parāçara said:—Thereupon obeying the mandate of their master the Daityas speedily bound him with ropes and threw him into the water. Thereupon with Prahlāda trembled the mighty deep; and being agitated throughout, it rose in mighty waves. Beholding the earth about to be submerged by the great ocean, Hiranyakashipu again said to the Daityas,—"O ye descendants of Diti!

In plain words: The king complains that Prahlada keeps praising Vishnu, his enemy, no matter how often he is stopped. The demons tie Prahlada with ropes and throw him into the sea. The ocean shakes and rises in huge waves, and the land is about to flood, so the king gives a new order.