I looked it up. There was no one on base, so probably no effect by the ball being touched. If there HAD been someone on first base, the umpires probably would have held him at third, any other base, and the runner(s) score. The thing is, if there were a runner on first, and the fan DIDN’T touch the ball, it MIGHT have gone past the outfielder, or he MIGHT have kicked it, allowing said runner to score. So, by fielding the ball, the fan might have cost his team a run. The, uh, adult, who hit the ball didn’t score, in real life.