Blows to see he center of the chest are very much known to cause changes in heart rhythm That is why you seethe precordial thump used at the start of cpr if no defibrillator is available. i have seen it work. i’m somewhat surprised there was not an AED brought on the field. Bet there will be one on the sidelines after this though the EMTs should have a defibrillator in their rig
football shoulder pads have sections that cover the heart area
They have them at college games. They’ve been required for many years.
I am surprised they didn’t get one out there right away. If you watch the various replays the training staff was acting “with purpose” more than if it were just a knee or ankle. Those guys knew pretty quickly.