Parāçara said:—Having thus thought within himself he bound his clothes tightly about him and jumped boldly into the pool of the serpent-king. The huge lake was agitated as soon as he fell into it, and the waves raised thereby began to sprinkle the distant trees, which being touched by the water and wind, thus poisoned, were immediately set on fire, and the whole horizon was ablaze. Having dived into the lake, Krishna struck his arms defiantly.

In plain words: Krishna tightens his clothes and boldly jumps into the serpent's pool. The lake churns, and the poisoned spray sets distant trees on fire until the whole sky seems to blaze. In the water, Krishna slaps his arms loudly to challenge the serpent.