Newt frowns and Sirius isn't sure whether to feel vindicated in his worry or if he should truly begin to panic. Kieren's been worried himself, of course, though he largely seems to be keeping it quiet, either because he's in denial or to save Sirius from further worry.

In truth, Sirius isn't at all certain he'll be able to make heads or tails of a thing Newt shows him, but he wants to have a look all the same. If for no other reason than it could give him better insight into possibly developing a spell instead. Magic, as far as he's concerned, supersedes any of this science business, but perhaps getting some sort of understanding of it might help all the same. Or they could even develop some sort of mix of the two.

"He's been bleeding as well," he continues, nodding quickly at Newt's invitation. "Not constantly, but here and there. Nosebleeds. Typically when he gets a bit, ehm. Excited. But not always. Sometimes for seemingly no reason at all. How is that works, do you know? If he has no blood flow at all, how is that possible?"