SPOILERS OF EPISODE 3 BELOW Anyone else see it? So good. So, according to Mycroft, Sherlock would go on a six month mission and die at the end. And he is never wrong, according to Sherlock. So, when Sherlock was outsmarted by Magnusson, he shot him and thus accepted his own death just to save John and Mary's marriage. The transformation of Sherlock over this series is so great.