My interpretation of Depth of field is when a certain area of the shot, usually either the foreground or the background is unfocused and blurry, leaving the other area to remain clear and detailed. This allows the audience to not be distracted by occurances or the set design, it can also be used to deliver a horror styled scene.
I think this technique was used in this scene to keep the focus on the main focal point of the scene, Sherlock and Moriarty. The background is blurred and so they wont be distracted and remained focused and observant towards the actions a detail of both the subjects. This results in a more engaging atmospheric scene in which the viewers remain focused on only whats important in this scene.
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