"Well. More like short messages or voice mails. I wouldn't write a whole letter out on it." Ain't nobody got time for that, least of all Qrow Branwen. He does admire Molly's fancy card tricks from out the corner of his eye, but for the most part he's paying attention to their surroundings as they walk. Keeping an eye out for bars. And hazards.

"No, no, it's not magic," Qrow corrects, like that should be obvious to anyone. "It's technology. You know... nuts, bolts, lightning Dust?"

...ok, it's not magic by Remnant standards. Also, Prismal technology probably does not run on the mystical 'natural' energy forces of Dust, as technology does back where he's from. Qrow is still going to assume like he knows all about this, though, because the tech is similar enough that it just couldn't be magic.