You'll notice the difference: they are my students. You are my assistant. If I menace you, it's only because I know you can bite back.

[Which she means, oddly enough, even if she's smirking as she pops those sweets in her mouth. There's some professors who treat their assistants as little more than that: a rank beneath them, there to help, but certainly not owed any respect. But Fawkes is clever, and deserves to be treated as such.]