Rules questions

[Steven Tyler]

1. High school game. Defense recovers a fumble, and is returning for a TD. I didn't see what happened, but the offense was flagged for 3 personel fouls on the return. I don't exactly recall what the white hat said, but I believe he used the term, targeting a defenseless player. I think the fouls were about 35 or 40 yards from the goal line behind the player running with the football.

The fouls were enforced on the kickoff, and the kickoff was from the returning teams 15 yard line. Since there has to be a 10 yard "buffer zone", the returning team was behind their 5 yard line.

My real question is what would happen if there and been 4 personel fouls, and the ball would have spotted athe 7 1/2 yard line (?), and there wouldn't be an actual 10 yard "buffer zone".

2. Duplicate numbers in NCAA game. I have seen duplicate numbers in NCAA games, and I know they can't be on the field at the same time. Last year watching a UTexas game they had 3 players wearing #19. A tight end, kicker, and some guy that had headphones on, and looked like he was probably way down the depth chart. My question is what is the actual rule about duplicate numbers.

These are just curiousity questions as I've never seen or heard of the two situations.