This is difficult. Credence feels a flush of panic that has nothing to do with taking his shirt off but instead because the man with the kind accent that reminds him of Newt is asking him about medical knowledge and Graves. Graves had used magic, though it wasn't much and probably put quite a strain on him.

He can't lie, though. Credence doesn't lie, it's bad to do so--he presses his lips into a thin line, before settling on something that's close enough to the truth that he feels comfortable enough saying it. "I don't know, sir. He's a very mysterious fellow."

And the next thing, the next subject to be tackled. Credence visibly hesitates, before making it a point to swing his gaze up and to the nurse.

"You can't tell anyone," He murmurs. "If I take my shirt off, you can't tell anyone. Please."