At first, John was simply annoyed that Sherlock had thought locking Gladstone away was the best way to deal with him. Then he realized how absolutely impossible it was that Sherlock was even there to be annoyed by.

Yesss, this, love this part!

This was great. I really wanted to see Sherlock’s first interactions with Gladstone, and this was so exciting. I’m so glad they warmed to each other eventually, and I agree that John’s mixed feelings toward Sherlock were certainly confusing Gladstone as well.