"Sure, you don't. So, why don't you cast a levitating charm, to prove me wrong?" Sally asked, expecting him to yell at her. He was really rather lucky her patience seemed to have heightened recently.
Sally was watching him carefully, waiting to see if he would collapse or something. He needed to go to the Wing and really, she didn't expect him to go of his own accord, and she didn't want to stun him. So it would be really helpful if he kind of just passed out, as awful as Sally felt for wishing it.
Sally matched Zabini, and took a step toward him, "I'm not pretending, and, just so you know, I don't expect to be repaid. But you're going to lose your magic anyway, probably already have. The least I can do is let you know that someone cares." Sally shrugged. Zabini wouldn't care if she cared or not, she knew. But she wasn't leaving him, and she hoped that he would at least realize that.