What figure of speech is the cacti were rushing upon him?

The phrase "the cacti were rushing upon him" employs personification, as it attributes human-like qualities—specifically the ability to rush—to cacti, which are inanimate objects. This figure of speech creates a vivid and dynamic image, suggesting a sense of urgency or danger associated with the cacti. It effectively enhances the reader's imagination by transforming a static element of nature into an active force.