A quick glance at this - What Is Commotio Cordis? - suggests that the blow needs to be more concentrated as from a baseball, cricket ball or hockey puck and it needs to be in a particular place. Fists are quite large and comparitively soft by comparison.
A quick glance at this - What Is Commotio Cordis? - suggests that the blow needs to be more concentrated as from a baseball, cricket ball or hockey puck and it needs to be in a particular place. Fists are quite large and comparitively soft by comparison.
And how big is someone's head that's wearing a helmet?