Joan drifts off easily, her body weary and recovering from oxygen deprivation brought about by the cyanide.

Sherlock keeps watch over them both. They've both endured such trauma, both physical and emotional, and Sherlock loves Watson and has come to care quite a bit for Ted as well. He's a cynic when it comes to questions of love, but even if he doesn't believe in romance, he believes in Watson and Ted.

Sherlock notices a twitch in Joan hand as she sleeps. It might be nothing, but he makes a mental note of it.