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In it, Billie provides some context for the choices made in the video (I know it caught a lot of people here off guard, including myself). According to her, the field bit is a visual metaphor of trying to run from something but it still catching it up to you. A small snippet also explains why she's smiling in some of the argument scenes - her and the actor were basically yelling random things at each other ("plastic fucking invisalign!!" at 1:44, lol).
No explanation for why it's lit like a Game of Thrones episode, though.
A few days ago, Billie also uploaded three one-shot takes from the filming of "Lunch". Consider yourself warned for lots of unfortunate clothing and charismatic eye contact with the camera.
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Sources:
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