Thereupon the Daitya-king spoke to the withering wind saying,—"Do thou, speedily, at my command, bring this vicious-minded boy to destruction". Saying "So be it" the wind immediately penetrated into his body—cold, cutting and insufferable, for his destruction. Perceiving that wind had entered into his body the Daitya boy again meditated, in his mind, upon the great upholder of the earth. And Janārddana, present in his mind, wroth, drank up that dreadful wind. And the wind thus met with its own destruction.

In plain words: The king orders a deadly, freezing wind to kill Prahlada, and it enters his body. Prahlada thinks of Vishnu, and Vishnu, present in his mind, drinks up the wind, which is destroyed.