Three Mondays ago, Southern Regional High School science teacher and Fishing Club adviser Jason Hoch was expecting one of his club members, 10th-grader Tyler Leary, to stop by during third period to tell him about a deer he’d harvested with his bow the weekend prior. Tyler’s father, Brian Leary, had texted Hoch about the deer, and told him Tyler was excited to relay the story of the hunt. But Tyler didn’t show.

Unbeknownst to Hoch, Tyler was in the hospital. His heart had gone into ventricular fibrillation in second-period gym…