Through her left eye quick throbbings shot, Glad signs the lady doubted not, That told their hopeful tale. The bright left eye of Báli felt An inauspicious throb that dealt A deadly blow that day.

In plain words: At that moment Sita's left eye twitches, which for a woman was a lucky sign, and she feels hope. But Bali's left eye also twitches, a bad sign for a man, warning of his death that day.