Adrian looked at the letter and read the contents through a few times, wondering if he should reply at all. Katie had known what he was, the entire Auror department had when he'd returned but they'd never been particularly close. Still, he supposed he owed her a reply if nothing else and he automatically felt sorry for anybody who'd had dealings with Greyback.
Bell,
I'm afraid I've always steered clear of Greyback for good reason and therefore cannot be of much help when it comes to information. However from what I've heard, him and Natasha are inseparable and, as we both know, he's incredibly dangerous.
It's also common knowledge that they're aligned with the Death Eaters but in fact they're largely separate; the wizards and werewolves don't tend to mix well at all and Greyback only respects the command of the Lestranges if at all.