"I don't think there's a rowdy student that Morag couldn't put in his place. And if worst comes to worst, she can kill them and clean them, and I'll cook them."
"Well then Miss Tonks - Dora - if you are willing to pay to learn to fight, it shall cost you a galleon a century. That makes the relationship professional," Antonin laughed.
"Ah, the Dark Arts," he went on, "that mythos the British and the Americans still maintain; judging a spell by its construction, rather than its intent. So tell me, Miss Tonks - Dora - remember that I am a Durmstrang graduate, are you willing to give up your prejudices and your fears? Are you really ready to learn to how throw and block Dark Magic? Are you willing to admit that you don't need this for your 'work', but for yourself?"