Narcissa lashed out, let the instinct of the Moon overtake her thoughts and then there was no Narcissa, no prim and proper House-Witch. She was just an enormous beast with blood on its mind and fangs that were driven to shred. A body collided with her -  hard, halting  - and she swiped out at its face, bit down when a hand came up close to her jaws. Distantly she was aware of Bellatrix; her sister had been thrown harshly into a wall and nearly gone all the way through it, the plaster and moulding a heap of rubble beneath her.