[When Flynn turns away, Sherlock flicks his gaze to John and then nods slightly to the left, indicating that he’ll take that direction and John the other so that they can keep a pincer movement to minimise the risk to them both if this devolves into a full on fight again.]

Good point, John, this really is the location that would mimic a greenhouse the best of all the buildings in this town. Imagine what you could grow here.