[Newt has been told no several time before. A normal person might take that as a sign of something wrong, but it's only made him persistent. He pauses, looking between the man and the fruit, before he tries again.]

She ate it without suffering any symptoms. I think it's safe to say it won't hurt you. [You, as in he's definitely not going to.] One of us has to stave off creatures if the other's incapacitated, and I'm better at that.

["Better" being not immediately killing them. And suffering the consequences with less complaining.]