Edgeworth sees her staring at the pin, and he watches her quietly, his eyes narrowing as he he considers her actions. While Kay's concerns are metaphysical, he can only see her hesitation as the sign of a guilty conscience. He doesn't want to think that Kay's mixed up with something dangerous, but her behavior makes him wonder: just what is her connection to the Yatagarasu?

There's no point in beating around the bush. Edgeworth steels himself and holds up her pin for her to see properly.

"Where did you get this?"