I've never liked Let's Kill Hitler as a title. To watch a show like Doctor Who you have to accept a certain amount of nonsense, like fixed points in time, but it's harder to do if you episodes go out of their way to remind you about the odd constraints they've had to place on their world to tell the stories they want…

Ah, I first encountered Treppaning in a novel set not long after the fall of Troy and it's been practiced throughout history, so I don't really associate it with Victorian England, but that's interesting.

He was trying treppaning, drilling holes in someone's skull to let out either evil spirits or unhealthy pressures, depending on when it's being explained. He makes a joke about it to Watson later in the episode. It fits with the theme of the episode, as Randy's texts disturb his attempts to reach a peace of literal…

That's the whole point though. This season is about how Sherlock and the people around him have been changed by their association. Sherlock shoots Magnussen because he is out of options. There is no way for him to protect Mary and John and Magnussen is untouchable through Sherlock's normal methods. He wants to entrap…