Intent. Grounding/Loss of Down/4th Down, etc.

[buckrog64]

NFHS Rules: 4th and 10 on A's 30. A's QB drops back for a pass and to avoid the sack obviously grounds the ball at A's 20. Spot of foul is behind LOS by 10 yards. I thought the penalty would be enforced from the spot of foul, then first down for B. In our game, our white hat took the ball back to the previous spot, I'm not sure he even marked off any yardage. Then it was B's ball. Giving the ball to B was about the only thing I thought he did that was correct. I didn't hear his explanation but supposedly he mumbled something about it being 4th down and that's why it's done this way.

I believe it should have been 1st and 10 for B on A's 15. Appreciate any comments.