“Jace threw his hands up. "So it doesn't work."
"Not necessarily," Luke said. "There might simply be nothing going on that might activate it. Perhaps there isn't anything here that Alec is afraid of."
Magnus glanced at Alec and raised his eyebrows. "Boo," he said.
Jace was grinning. "Come on, surely you've got a phobia or two. What scares
you?"
Alec thought for a moment. "Spiders," he said.
Clary turned to Luke. "Have you got a spider anywhere?"
Luke looked exasperated. "Why would I have a spider? Do I look like someone who would collect them?"
"No offense," Jace said, "but you kind of do.”