Christopher doesn't follow right now. Instead, he sits down in the diorama, running his fingers over the false flowers. The corner of his eye watched Sherlock's movements, assessed and remembered them. A thoughtful hum like that is a confident choice or a careless mistake in a place like this. Christopher hasn't yet decided which Sherlock is.

"That's all right. As I don't have any instincts for it either, I can make up for what you're lacking by doubling what I have. We'll be perfectly balanced."