" Isabelle! he called again. Let down your raven hair. Oh, my God, Clary muttered. There was something in that blood Raphael gave you, wasn't there? I'm going to kill him. He's already dead, Simon observed. He's undead. Obviously he can still die, you know, again. I'll re-kill him. "

― Cassandra Clare , City of Heavenly Fire (The Mortal Instruments, #6)