I'm actually planning on a sequel (*gulp*) where I explain exactly what he did better, but, essentially: John basically exploded with protective magic. So anyone in the building with truly murderous thoughts was wiped out by it, including the vampires. Moriarty wanted to burn the heart out of Sherlock, but John burned the evil out of Moriarty. It just, you know, killed him. :D I think that makes sense?
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I'm actually planning on a sequel (*gulp*) where I explain exactly what he did better, but, essentially: John basically exploded with protective magic. So anyone in the building with truly murderous thoughts was wiped out by it, including the vampires. Moriarty wanted to burn the heart out of Sherlock, but John burned the evil out of Moriarty. It just, you know, killed him. :D I think that makes sense?