You don't see a lot of pigs with that kind of aggressive behavior. At least I don't at our land between Bastrop and Lockhart. I've hunted many hogs there. I see them all the time. I've chased them on foot and 4-wheeler, I've shot many, I've been face to face with them on my belly with a pistol...still have never had one charge me unless I'd already shot it and it was a desperation move by a cornered and wounded pig.
Just this morning I got bored in my hunting stand and tried to stalk some piglets with my knife. They got away but I got darn close...
I know that sounds kind of cavalier but I did have my pistol as well (loaded with hardcast rounds).