Katie rolled her eyes, her look very much saying that he definitely should be sorry. Yeah, it was a bitch attitude to have, but it was Marcus Flint. She wasn't exactly inclined to be nice. Whether or not this had been her fault, she wasn't about to admit that to him. Or apologize. She was sure he'd done something, somehow to deserve it, anyway.
Nor was she going to admit she hadn't been paying attention or give away what she'd been thinking about. Worries about Ange, her friends at Hogwarts, whatever. It was nothing she cared to let Flint in on.
"Don't you have someone else's day to ruin?" she snapped sharply, never mind that he hadn't done much to deserve it just now. His existence was reason enough to be a bitch, wasn't it?