CC usually occurs after a high impact force to the chest by a small, usually round object (baseball, hockey puck, fist). Cardiac conditions such as myocarditis or HCM would increase risk. I have not heard of a football injury causing it, but I will dig deeper.
FTR, I never said that the shots caused what happened last night. We likely saw a player die with our very own eyes, and if there is something that could be done to screen for the risk of it happening again, it should be considered. Athletes routinely get pre- participation echos and EKGs at the start of their careers. Even if the risk of post-mRNA shot myocarditis is small, I would rescreen before further participation.