Greta bristled a bit at Z's laughter, but then she had to admit she didn't cut the most intimidating figure. She let herself relax a little.
"Okay, so maybe I'm not going to be sending students scuttling away in terror if I catch them rule-breaking, but I am on staff, and responsible for things like school equipment, and you are a student here, right? I suppose if it would make you feel better to be disciplined by a proper professor, rather than just the Flying Instructor, I could always pass this along to your Head of House instead. You know, if you don't want to deal with me."
She gave Z a smirk. She was pretty sure that dealing with the Head of Slytherin wasn't going to be as appealing for Z as trying to talk her way 'round an old schoolmate. Still, she couldn't help an internal wince over the fact that she'd essentially just threatened to tell on Z to somebody with more authority. She really hadn't been planning to hand off the first troublemaker she came across - even if it was someone like Z.
Greta frowned. "But what do you need with anyone else's brooms? I'd have expected you to have your own broom - probably the best that your parents' money can buy."