By the time Lucius returns, there are only two living persons to greet him; one of them is Severus, clean of blood, holding his wand. The remaining terrorist is on the floor, curled over on himself, fighting against the paralysis spell and whatever else has been inflicted on him.

"Not quite," Severus says, dispassionate and nudges the prone man with his foot. He flinches away. "We were having a heart-to-heart. It seems he's particularly fond of beating unconscious women."

Severus twitches his wand and his prisoner hisses, there's a particular twisting noise from the floor. Some unpleasant curse, impacting unseen ... parts, internal or otherwise.