Narcissa had been sleeping soundly for the first time since Draco went back to Hogwarts. So it was only appropriate that this night would be the one night that she would be awoken from her silent slumber. At first she thought it was the House Elves cleaning up their mess that she and Draco had left in the kitchen or family room, but then she very distinctly heard her sister's voice scream "crucio". Her eyelids flying open she didn't even bother putting her feet into the slippers beside her bed. Instead she grabbed her wand and ran as fast as she could towards the noise.
When Narcissa reached the family room she found Draco and Bellatrix duelling which was something she was sure their Lord would probably not like, nor was it something that she herself liked. She didn't want to see either of them dead.
"Stop it right now," Narcissa summoned her best mothering voice, which was not something she did often and flung the expeliamus spell at each offender to get their wands from them and stop them from fighting. "What the bloody hell is going on here?!"