"I must congratulate you then, Professor Lafay," Risu said in his best attempt at a high-minded voice. "Your... solution, pun unintended, seems to have proven to be extremely effective. I mean, I have never even heard of 'Galman Fever'!

"And," Risu continued, although his voice had long abandoned its high-minded tone and plunged into fatuousness (Risu was certainly enjoying himself), "I have to confess that there's, er, a barrier of ignorance on my part surrounding that second potion you invented." He dropped the pretence now, and laughed openly again. "I'm sorry. Please don't think I'm mocking you, Professor. I just don't know anything about your subject. I took Potions at school, of course, but I was never very good at it. Afterwards, I went to a Muggle university, and then a Muggle research facility, and I had practically nothing to do with chemistry."

He tapped a finger on his papers and the scientific journal he had brought with him. "This is where my expertise lies. So... what is Galman Fever, and what's a barrier potion?"