The NCAA has gone back and forth on this. I don't know about what the original rule was, but at some point, holding WAS a previous spot enforcement like it is now, then in the early '90s, I believe, it went to a spot foul enforcement if behind the NZ by Team A. At some point they changed it back. I think the thought was that 10 yards from the spot of a foul that is almost always behind the neutral zone is a bit too much -- Team A might hold 6, 8, even 10 yards behind. Then you have plays like 3rd and 30!