Here the mist swallowed is a use of metaphor, so this would be a personification, and here is an exaggeration of the word swallowed, so this would be a hyperbole.
What is hyperbole?
It is a rhetorical device or figure of speech.
A hyperbole is an exaggeration of the words to describe something.
Examples are I am so hungry I could eat an elephant.
Personification is the representation of something using a metaphor.
Thus, the use of swallowed is an example of personification and hyperbole.
Learn more about hyperbole
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