Very sad to see
Full disclosure, I’m a physician but not a critical care physician or cardiologist. That being said that looked and sounded like a primary Vfib/Vtach arrest from an underlying cardiac etiology (genetic channelopathy, coronary artery anomaly, less likely HOCM because these guys are screened for that) and he was shocked back into rhythm and now going through cooling protocol on the ventilator. They’ll try and wake him up in about 48 hours to see if he suffered any sort of anoxic brain injury. In a perfect scenario he walks out of the hospital looking fine a week from now. Hopefully the young man makes it.
I will say I doubt the tackle had anything to do with it. Getting hit hard in the chest can rarely cause this but it’s unheard of with routine tackles in pads. It’s like a batter getting hit by a fastball in an unprotected sternum. The timing here was coincidental I suspect.