Looks just like mine did about 3 or 4 years ago. Same line it split along, but I had three grip pieces after.
A Steel frame gun will hold up better and you wont break your hand.
The energy does choose the path of least resistance, but the energy is dissapating in more than one direction, straight down and into the mag and grip, and also out the barrel as gas has gone that way sending the bullet out the gun. I've seen a few 38 supers go kb in steel frame guns, tore up the mag base pretty bad, but no user injuries, and the 38 super ipsc load from back when it was 175+ is generating a lot of pressure.
Dont worry about the flinching next time you go out, pick a gun right up and shoot right away. Just like getting back on a bike after falling.
Load your own ammo, or buy factory, dont trust someone else to do it right unless you really know the person.
Were you covered in all sorts of grey dust after too? I still havent figured out what that was after my hk blew up.
Also, be prepared for something around a $300 quote for repair.
My best recollection is that was what I was quoted until they agreed with me that it wasn't anything I did, but possibly the factory ammo I was using at the time.