I don't understand."
"How can you not understand?" He pointed at her books. "You read novels. Obviously, I'm here to rescue you. Don't I look like Sir Galahad? ... My strength is as the strength of ten, Because my heart is pure - "
Something echoed, far away inside the house - the sound of a door slamming.
Will said a word Sir Galahad would never have said, and sprang away from the window.

Author: Cassandra Clare