"Oh, a wonder," Magnus says. "Her feathers are coming in and she's so funny-looking right now. I'd murder a man for her if it came to it." (This, of course, is a much bigger declaration, from Magnus Chase, than saying he'd die for her; he's died a bunch. He's also killed a bunch, but he's never specifically, directly murdered a mortal human, even if he does blame himself for his uncle's death.)