PLANO, Texas — In October of 2018, Julie Coon was volunteering outside Plano Senior High School, handing out pink ribbons for the drill team’s “Pink Out Day,” when her world went dark.

“I went from talking to my friend to just dropping to the ground,” she said. “It was like a light switch off.”

Total strangers saw her collapse.

Within seconds, a pair of twins on the volleyball team, named Christy and Riley Winkler, called for help—alerting their bus driver, a first responder, who sprinted over and sent the girls to find the school’s athletic trainer. They began CPR, while the twins ran for the school’s automated external defibrillator—the small device that can shock a heart back into rhythm.

“They had all the equipment and two trained responders to tag team and do CPR and shocked me wi

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