No, it wasn't made of stone, hence it cracked open!!
Where did it crack open Zoso?
Most of the damage to the head was caused by the bullets!
The final shots to the top of the head scalping him!
My knowledge of the case may be vastly inferior to most posters on here, but I can assure you I have studied the crime scene evidence and the injuries to the victims in great detail.
As you know Zoso, my main interest is crime scene scenarios, the complete opposite of you!