[Rose's face is just. She has no idea what Clary is talking about right now and no matter how she rearranges those words in her head, she's coming up blank.]

Uh... wait, the dead don't stay dead thing? Not the zombies. [A beat.] At least... I don't think? We die, we come back. They die... I don't know if you've ever seen a dead Zombie before but it's just a lot of gross.