Read the following passage from Poe's "The Fall of the House of Usher": On one of the staircases, I met the physician of the family. His countenance, I thought, wore a mingled expression of low cunning and perplexity. He accosted me with trepidation and passed on.

This is the description of what happens when the narrator first gets to the Usher’s house. What literary term might be in use here?

Metaphor
Foreshadowing
Paradox
Symbolism