A jet of green light shot from the end of Snape's wand and hit Dumbledore squarely in the chest. Harry's scream of horror never left him; silent and unmoving, he was forced to watch as Dumbledore was blasted into the air. For a split second, he seemed to hang suspended beneath the shining skull, and then he fell slowly backward, like a great rag doll, over the battlements and out of sight.