The other night Toronto Blue Jays pitcher J.A. Happ endured one of the most viscous hits I have ever witnessed a player take.
No, the hit was not from a batter charging the mound. This hit to the left ear came from a baseball hit with enough force as to still travel nearly the length of the field after impacting Happ’s skull. The impact of ball on skull was also so violent that the sound could be heard all the way up into the press box at Tropicana Field.

Photo R Anderson
Granted one could argue that sound travels further in a dome but still picture the type of force required for the sound to be heard that far away.
During my years covering high school and college football I witnessed many violent hits. On a few occasions I even heard bones break and tendons snap so I know the sound of agony when a player goes down.