This cardiac incident is actually well documented. As a Little League coach for my son's team, had to watch a video on spotting the signs of cardiac arrest due to being hit in the chest by a ball.
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Commotio Cordis: Causes, Symptoms & Treatment
Commotio cordis is an abnormal heart rhythm (ventricular fibrillation) and cardiac arrest right after getting hit in the chest, usually while playing sports.my.clevelandclinic.org