"Keep up," said an irritable voice in her ear. It was Jace, who had dropped back to walk beside her. "I don't want to have to keep looking behind me to make sure nothing's happened to you." "So don't bother." "Last time I left you alone, a demon attacked you," he pointed out. "Well, I'd certainly hate to interrupt your pleasant night stroll with my sudden death." He blinked. "There is a fine line between sarcasm and outright hostility, and you seem to have crossed it."