The World Again, a Step to the Left

Moriarty was back and destroying everything and everyone who got between him and a certain artefact, one that John was desperately trying to get to Sherlock. When Moriarty found him John thought it might be the end, that he was going to die. When Moriarty shot him he was sure of it. But then John woke up in a world that wasn't his own, where Moriarty was dead but everyone else was