punctuation - "Knows an awful lot about the Dark Arts, Snape"



He teaches Potions, but he doesn't want to—everyone knows he's after Quirrell's job. Knows an awful lot about the Dark Arts, Snape.



From time to time I stumble upon this type of speech with comma + name after the main text to emphasize on a person. So, pronoun-text-comma-name.


Is this a specific dialect? Like, for example "I gonna kill'em" sounds southern-ish US.


English is not my mother tongue though I read a lot and such subtle things are of highest interest to me.




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