In this moment, Thérèse catches a glimpse of Laurent’s true nature. She realizes that he has no shame at all when it comes to getting what he wants. He will do anything to ensure his own happiness or wellbeing, and he has no qualms about exploiting Madame Raquin’s grief. She, on the other hand,
does seem to feel some remorse about what they’ve done, so it’s shocking to see just how callous and cold-hearted Laurent really is.