Batting from both sides of the plate is not uncommon. Especially in California.
Booty-Gigg has a child.
Maybe the shaft of the hammer was a sex toy. You never know. Maybe Paul was getting a little rough with it, so the guy whacked him with it. No vasoline on the handle, a little S and M , ramming it deep, and the guy flipped.
They need to check the handle for fecal matter and DNA.