Dr. John Watson
Quote 16
I could see that Holmes was favourably impressed by the manner and speech of his new client. He looked her over in his searching fashion, and then composed himself, with his lids drooping and his fingertips together, to listen to her story (Beeches.21).
Even if Watson can't follow Holmes's mental deductions just by looking at him, Watson does have insight into Holmes's emotional state. After all, what are friends for? This is a nice, subtle piece of intimacy between the two guys: Watson really knows Holmes's mannerisms.