Draco's head whipped around at the sound of his aunt's voice and his eyes narrowed dangerously. He knew first hand how dangerous she was.
His wand came out and he pointed it at Bellatrix. "Crucio." He uttered the curse coldly, putting every ounce of hate he had into it.
He turned his head just slightly to half smile at Ginny, though there was no warmth in it. "The kill is yours." But there was no harm in hurting Bellatrix a touch first. He knew his Aunt and he knew that short of Dumbledore and Voldemort themselves she had no equal in terms of dueling. He even knew that it was more than possible that the pair of them together might not be able to take her.