Some of the odd behavior he exhibited the night they went out for dinner in Diagon Alley made sense. Despite what he was trying to show to the contrary, Antonin didn't want to be the Dark Lord's replacement. Never would he come right out and admit so though. That would be dangerous. Maybe he used to have real ambitions about ascending to the throne, but somewhere along the line, he'd changed his mind. If being forced to kill the little girl with hair like his wife's was his turning point, she wouldn't be surprised. Everyone had a limit of what they could bear. Evidently, her husband finally reached his.