It was a tentative smile. Luz knew about those: she'd given some of them herself in situations where she wasn't sure what she should feel. At least Chizuru seemed a little better off though.

"Me?! Oh no, I meant there are people here who were heroes back home! I do, you know, feats of magic and help people, that's all!"

Normally Luz would have understood that indicated heroic actions, but considering she'd met kids close to her age who had being a hero as a profession? She took that onto consideration.