The reason why Andrew was proud of Victoria was because even though he saw that she was calm and composed, there was still a chance that she would embark on the journey of torturing Marchioness Vilotti.
She had murdered her mother, who was her most beloved being and now she had her at her complete disposal, so it wouldn't be strange if she wanted to get even in the most cruel and brutal way, but she chose to just end the matter quickly and move on with her life.
Andrew didn't drag things out either and quickly killed her using the power he had within the Heavenly Palace. Within this place, he had control over everything, and that included the lives of its inhabitants, so with a single thought he extinguished the life of the Marchioness.
Victoria noticed as Andrew hugged her, that he had already eliminated her mother's killer, so she shed a few tears, as a final farewell to her mother.
