"What happened that night?" Clary asked, both of them knowing exactly which night she was referring to.
Jace ran his fingers through her hair and breathed deeply, "I don't know." His eyes looked ahead, but they were focusing on something that Clary couldn't follow. "I remember the fight and then a stinging on my shoulder blade."
"Turn around," Clary ordered, lifting off of him so Jace could obey. Sure enough, the shadow of an obedience rune had been drawn on his back.
"Sebastian," Clary seethed, "He used this rune to bring out the darkness in you, Jace."
Jace was silent.