In the story "the leap" how do lines 15 - 21 act as a flashback? what clues do they give about for the rest of the story?

well for some you have to do on your own on a paper but yeah

cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.

8 ish depending on the what grade