I gave this example in my pregame: Team K's punt from his end zone is blocked and his rolling toward the sideline at team K's 7 yard line. R38 dives for the ball at the 7 and forces, new force, the ball into K's end zone with K recovering or forces ball out of K end zone. This should be a touchback because of a new force by R. My crew said the ball must be "at rest" before you can have a new force. My state association has also said that I'm wrong and the ball must be at rest beforce you can have new force. The "at rest" principle is a NCAA rule and not a NFHS rule. No doubt were going to make absolutely sure there's a new force before we rule touchback.
Yes it is true that NFHS makes no statements about a loose ball at rest or not.. The only decision an official has to make and this is a
judgemental decision, is would this loose ball have made it into the endzone or not and if he decides it would, then the original force has NOT be expended.
Is that too hard to do? well yes it could be, so take your time and figure it out before racking up that TD/TB or Safety.