A gentleman I was Facebook friends with managed to acquire a young male warthog, then later a female. He kept a lot of exotics, mostly reptiles and standard unusual farm fare like llamas and ratites.
He loved that warthog and had raised it from a very young age, having even visited it at it's previous residence at a petting zoo. I thought it was the coolest thing I'd ever seen, until I didn't.
One day he had to make some repairs to the fence in the enclosure he'd built. The male was mature and had paired with the now also mature sow. Every time he bent down to tend to the fence, the male charged and cut his legs out from under him. There was nothing he could do about it but scream once the boar started goring him when he was on his back. He managed to get himself to safety after sustaining life-threatening injuries. The pictures he posted were nothing short of horrifying.
In short, I'm probably going to pass if I even have a chance to buy a warthog.
I hope your friend healed from his injuries