What form or rule is demonstrated in this sentence?

Question

The blazing sun and stretches of sand--everything added to the fugitive's misery.
dash used for summary
comma used with two or more adjectives preceding a noun
dash used as interrupter

Answer 1

The form demonstrated in the sentence is "dash used for summary." The dash introduces a summary or conclusion that encapsulates the two preceding elements, "The blazing sun and stretches of sand," by explaining how they contribute to the subject's experience.