I’ve Wondered A Lot Why Sherlock Chooses THIS MOMENT To Lose His Cool. He Is So Even Tempered Throughout

I’ve wondered a lot why Sherlock chooses THIS MOMENT to lose his cool. He is so even tempered throughout the entire episode – while his reputation is tarnished, while he is suspected and arrested, even while he plans his death – but it’s John potential doubt that makes him lose his edge. Why? What has John ever done to lose Sherlock’s trust?

Then I remembered this:

Moriarty caused Sherlock to doubt. Moriarty successfully played with Sherlock’s mind, just enough to make Sherlock doubt John, and think that John was Moriarty. It was just a few seconds, but it happened. Sherlock doubted John. And if a great mind like Sherlock’s can be tricked into doubt, obviously so can John’s.

But the best part? John does not doubt. Not for a second. Moriarty has beaten Sherlock, even if only for a second – but he never beats John.