§ Of Túrin Turambar The Silmarillion

But as he stood, finding himself free, and ready to sell his life dearly against imagined foes, there came a great flash of lightning above them; and in its light he looked down on Beleg's face. Then Túrin stood stone-still and silent, staring on that dreadful death, knowing what he had done; and so terrible was his face, lit by the lightning that flickered all about them, that Gwindor cowered down upon the ground and dared not raise his eyes.'