Since it hit just his groin, then it could have been buckshot, slug, whatever and the dammage would have been the same.
I think everyone here has heard of hunters pulling their shotgun (with birdshot left in it from bird hunting) by the barrel and offing themselves with a chest full of shot. Never heard of one of them getting up after being hit with a load in the chest.
My wife was a ER nurse, CV OR, head of CVICU, and a bunch of other positions. She said shotgun wounds were the worst and almost always carried in, not walking in like many handgun wounds (especially .22 and .25, lots of them walk in talking.)
"The government has confiscated all of our rights and is selling them back to us in the form of permits."