Idunn thought on this question for a long moment as she weighed options.

"I suppose I must say Headmaster Black," she decided at last, "if we consider only individuals I could be reasonably certain to encounter. As the patriarch of a notable family, after all, he bears a great deal of social clout, and as headmaster of our school," Idunn continued, "he holds sway, to some degree, over each and every young witch or wizard. Would you agree with my conclusion, Mr. Leverett?" the redhead asked, finding herself genuinely curious.