Obliviation may just feature one incantation, but it is a lot trickier than that, if you would rather go big than go home. She is shocked, when it hits Lucius, but she remains, within her means, on track. This has not been a thought-through attack, this was the spell in its simpler version. Recent memories wiped, not a whole life. She sways slightly, now that Lucius has gone blank beside her for a moment, and it may be cover enough for the glimpse of the Dark Mark she got. He should be one of them.

Were she sober, were she at least not about as far away from sobriety as a person can be without succumbing to a poisoning, she would opt for stone cold murder. As it stands, she might miss, she might fail, and even with her mind numbed to this degree, the only thing that can make this situation worse is absolutely proving him right and then failing to get rid of the evidence. Him. She doesn't dodge, nor does she conjure a shield, and she doesn't draw her wand, against every fibre of her being. She holds her hands up in surrender, and her aim is obviously to talk him down.

Her wrist is still entirely blank.

"Your time must be darker than ours, Draco."