What is the purpose of one of the flashback in the short story The Phoenix

Okay can someone tell me the answer to this problem bc i have to buy it now and i don’t wanna do that

Meter you are working as an apprentice for the bksb newcastle arena. an indoor sport exhibition is coming to the arena. your supervisor has asked you to set up a handball pitch and seating area as shown in the plan view below

When you wear your earbuds while working out, your sweat damages them and they die sooner