The Man by Bram Stoker Chapter 14 Page 10

Indeed, this but added fuel to the flame. In the presence of a stranger some of her habitual self-restraint would doubtless have come back to her. But now the necessity for such was foregone; Harold was her alter ego, and in his presence was safety. He was, in this aspect, but a higher and more intelligent rendering of the trees around her. In another aspect he was an opportune victim, something to strike at. When the anger of a poison snake opens its gland, and the fang is charged with venom, it must strike at something. It does not pause or consider what it may be; it strikes, though it may be at stone or iron. So Stephen waited till her victim was within distance to strike. Her black eyes, fierce with passion and blood-rimmed as a cobra’s, glittered as he passed among the tree-trunks towards her, eager with his errand of devotion.