I believe that after Grace gained the sport, she was a recipient of Mr. Le Bail’s fortune and curse. It would clarify the nod we see him give her when he briefly seems in his chair. I additionally consider that’s why Alex didn’t explode till she took the ring off. When you marry somebody, you change into your individual new household unit. Alex existed in that second as a part of the Le Domas household, and in addition as a part of his household with Grace. Once she eliminated the ring, she broke their bond, and he was now not a part of her household. He was a full authentic Le Domas, and due to this fact eligible to die.