I have one that we saw in my son's 9u game in an RMSB tournament. I put the category as MLB because I believe they use MLB rules.

Batter hits a ball off the end of his bat putting a ton of spin on the ball. The ball lands in foul territory half way down between the plate and third base. Because of how far foul the ball lands the umpire assumes it's going to stay foul and calls it as such. The runner stops running. However, the ball spins fair. The third baseman picks up the ball and throws it to first for what could be a put out.

What's the call?