Cassandra Clare said this quote

she glanced down and saw that a glove of blood covered her lower arm from the elbow to the wrist. The arm was throbbing, stiff, and painful. Is this when you start tearing strips off your T-shirt to bind up my wound? she joked. She hated the sight of blood, especially her own. If you wanted me to rip my clothes off, you should have just asked. He dug into his pocket and brought out his stele. It would have been a lot less painful.