The NFL has been around in some form or another since 1920. Between then and now, this is the first incident of impact induced cardia arrest has happened on the field. That alone should tell you how rare this is. This requires millisecond precise timing.
xdrakennx t1_j36oi0b wrote
Reply to comment by Lola_PopBBae in Damar Hamlin's first question after waking up was 'did we win?' doctor says, days after his cardiac arrest during NFL game | CNN by reddit455
The NFL has been around in some form or another since 1920. Between then and now, this is the first incident of impact induced cardia arrest has happened on the field. That alone should tell you how rare this is. This requires millisecond precise timing.