On the afternoon of April 19, Diego Fernandez-Delgado was driving down South Flamingo Road in Cooper City, Florida, when one of his tires blew. The 65-year-old pulled over to change it, but he had two problems: his phone battery was dead, and his chest had started to hurt.

What he didn’t know was that he was having a heart attack on the side of the road, with no way to call anyone. According to his son, he prayed.

Inside the McDonald’s at that same intersection were three Cooper City High School students, 16-year-olds Logan Royer and Cody Magrone, and 17-year-old Brody Murray, out for a fishing day. They spotted the man struggling with his tire from across the lot and didn’t overthink it.

“We saw him on the........

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