Daphne knew that Sara was making a not-so-subtle threat. One thing she did know was that Sara would likely be able to do almost whatever she wanted to her, but that there would be consequences for her to pay if she ever laid a finger on Sara. "It's Hogwarts. No one has any servants here." Her condescending tone was perfect to add a "duh" at the end.
Unable to resist the urge, she crossed her legs showing them off. Daphne's green eyed gaze rested on Sara. It seemed she wasn't going to attack her. What was this about then?