Just curious? He'd bet it was more than that, but he let it go for now. She still seemed rather comfortable with him, so no need to pressure her for answers just yet, and he wasn't in the mood for another round of Obliviation. Too much of that and it softened someone's brains - as evidenced by several people in his department.
"Did the interview go well? Who conducted it?" he asked, interested in her answer. He'd like her thoughts on Bellatrix, especially. They seldom were able to hear what the common people thought - it might do good to listen occasionally. And if they didn't like the answer ... well, there was always a way to fix something.