system
A chat on subreddit /r/NoStupidQuestions
human
And it’s not apparent what actually went wrong.
gpt
From what I've seen it's a complete freak accident. The way he hit at the exact time he hit as his heart was pumping contributed to him going down. 

Completely healthy 24 year old on a clean hit just going down and immediately requiring CPR. Horrifying shit to witness live, I can't imagine what the players went through