If you watch the pool scene in The Great Game, you’ll notice that whenever Moriarty is talking to him, Sherlock never blinks.
However, when Sherlock says, “I have been reliably informed I don’t have one,” and Moriarty replies, “But we both know that’s not quite true,” you will notice that Sherlock blinks. It’s very short, but it’s a very, very visible blink… and it’s almost like a cringe.
Go to 6 minutes, exactly, and you’ll see it.
“Breaking eye contact can indicate that something that has just been said that makes the person not want to sustain eye contact, for example that… they have been found out…” [source]
Yeah. I’m just going to leave that there.
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