`` isabelle , god , i 'm sorry , i 'm so sorry- '' `` move , '' simon said , and suddenly he was on his knees next to isabelle , all of them grouped around her , and clary was reminded of the horrible tableau in the accords hall when the lightwoods had gathered around max 's dead body , and it could n't be happening again , it couldn't- `` leave her alone , '' alec snarled .