Katyn isn’t specifically against killing, but there needs to be reason for it, and she’s not going to go for killing someone who’s helpless or killing for fun, both of which it seems Ry did since he sealed the doors to that compound and wouldn’t let the werewolves out. There’s a line and he crossed it.

It’s kind of funny that he attempts to justify himself NOW, however.

EDIT: “change” should be “chance” in panel 3. Sorry, I’ll fix it as soon as I get a “change”.
REVENGE OF THE EDIT: Should be fixed now, sorry for the delay!

Thanks for reading! See you next week!