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I rarely say this to people who aren't me, but you've got to calm down.
— Emily ‧ The Devil Wears Prada

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker urges another person to calm down, while admitting that this advice is usually directed inward. The admission complicates the authority of the instruction. Read as self-aware humour, it allows a glimpse of personal tension inside an attempt to manage someone else's.
Context reviewed