I tried to warn you... but one thing is for sure the a-hole that did this to her did not put that crack in her skull accidently. Maybe he did it because she screamed.
another childhood story of mine... When I was nearly a teen. I was showing off my back dives to someone and I was doing them so quickly (dive, get out the water, get back on board the put my toes on the tip of the board and do my back dives.) The last time I did it I thought I was at the end of the board, but actually I was about 3 feet away from the end when I went into a full force push off back dive. Well the back of my head hit the end of the diving board and in the water I went. It didn't knock me out, it didn't crack my skull, but it busted my head open real well (blood every where. I had to have a double layer of stitches in my head. You can imagine how hard this person had to hit her to crack her skull like he did.
WOW....my oldest son did the same thing on a diving board, but he hit the top of his forehead...in the hairline.....like you said, blood everywhere..........the person who did this is a monster, the force he must have used to crack her little skull....sigh!