Oliver liked how she straightened to the point without trying to play mind games with him. It was almost like she wasn't really interested and he wanted to know what she was planning, but at the same time he felt like it wasn't his business, so he asked about the question that bothered him.
"Do you know anything about my mother? I know this is not something surprising for Tetsukyojin, after all, your attacks only came because she disappeared. Which made me think you had something to do with her disappearance," Oliver was careful with his words, and kept checking the Head Shrine maiden's reaction when he said those words, and he found it interesting that she didn't really show anything.
He was also careful enough not to mention Fujikiri since he didn't know what kind of a reaction her name would create from the people in Dynasty or shrine.