The desire to slit his throat with her favorite spell was overpowering. What would happen if she did something that drastic? Evidently there was some sort of agreement between her husband and Lucius Malfoy to keep Draco out of harm. Would Lucius try to kill her in his grief? She didn't fear the drunkard even on his most sober days. Only the very real fear that a man who had nothing to lose wouldn't hesitate to take his anger out on her son kept the curse off of her tongue. And the faintest suspicion that Draco was simply playing a part and there was more to his actions than she was aware of. It was enough to push her fully off the cliff towards her insanity.