"Don't - don't touch that," Newt said, and swatted her hand away.

Then, without looking at her - "I'm sorry. But I really shouldn't answer these questions." He didn't want to have to obliviate her only for his own carelessness in speaking in front of a Muggle.

Though suddenly, as he regarded her, he wasn't entirely certain that she was a Muggle. Almost involuntarily, he sniffed the air around her.