Perhaps Aubin thought that Thorfinn would just kill him with an Unforgivable like he'd done his wife. It would've been painless and over before he knew what was happening. Monsters like him didn't deserve such an easy death. Not once did Thorfinn even bother to remove his wand from his pocket. He uttered not a single spell. It was his desire to do everything by hand. Aubin didn't remain silent long. His screams likely could be heard in every corner of the massive mansion.