§ Of Túrin Turambar The Silmarillion

The screams of Glaurung rang in the woods, and came to the people that waited at Nen Girith; and when those that looked forth heard them, and saw afar the ruin and burning that the dragon made, they deemed that he had triumphed and was destroying those that assailed him. And Níniel sat and shuddered beside the falling water, and at the voice of Glaurung her darkness crept upon her again, so that she could not stir from that place of her own will.