NFHS interp screwup?

[SNIPERBBB]

If anyone is in theNFHS softball umpire group you may of seen this discussion.

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Rule 8-1-1 says a batter becomes a batter-runner when "a. the batter legally hits a fair ball."

Rule 8-2-7 says a batter-runner is out "e. by making contact with a fair batted ball before reaching first base."

So why are umpires discussing whether a batter-runner is still inside the batter's box or not when she hits a fair ball and then, as she takes off for first base, she contacts the fair ball? And that if she's still in the batter's box (e.g., neither one of her feet has contacted the ground completely outside of the box when she contacts the ball), it's a foul ball? Nowhere in 8-2-7 is the batter's box referenced as a "safe haven" to a batter-runner.

Play: Right-handed batter squares to bunt, and the bunted ball bounces in front of the plate and starts to move forward towards F1. As the batter-runner (not a batter any longer per 8-1-1a) takes off for first, she contacts the ball with her right hip and redirects it towards the first-base line.

Tell me which rule says that this is a foul ball if neither of the batter-runner's feet have contacted the ground completely outside of the batter's box?

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Thoughts?

I'll post the interps that kicked this off later