“It's Simon. He's missing."
"Ah," said Magnus, delicately, "missing what, exactly?"
"Missing," Jace repeated, "as in gone, absent, notable for his lack of presence, disappeared."
"Maybe he's gone and hidden under something," Magnus suggested. "It can't be easy getting used to being a rat, especially for someone so dim-witted in the first place."
"Simon's not dim-witted," Clary protested angrily.
"It's true," Jace agreed. "He just looks dim-witted. Really his intelligence is quite average.”