[E. Pluribus Unum]

The man clearly got hit and it could’ve been just right to kill him.

Totally normal for a football player to be killed by a hit.

Happens every day.

[the OlLine Rebel]

Some hits are just right.

Does indeed happen all the time.

Thankfully not as much as to be so fearfully bad, handicapping or deadly.

[Jim Noble]

Multiple deaths from cardiac arrest (commotio cordis) in HS football every year.

Here's a paper that reviews 243 deaths in high school athletes, mostly football, from 1990-2013.

Here's a review of cardiac arrest after blunt force trauma to the chest (commotio cordis), which has been well known and well understood for many years.