Good chance it was shot between the eyes?
That doesn't work well.
As a youngster I saw a hog "stuck" once.
Some Polish dude, a friend of a cousin, wanted the blood for
blood pudding. They got a loop around the hogs back leg, over a beam,
And hoisted it up. The "Pro" then cut it's throat. Catching blood in a pitcher
while the hog squealed, blew blood, sucked blood and swung around.
It wasn't pretty, it wasn't quick.
I will never watch that again.