Basic question re: foul balls

[FMadera]

I'm not a baseball umpire, but I need a ruling from you all for use in discussion on a scenario for another sport. It should be a fairly basic answer for you, but I don't have a rulebook, so I'll yield to your answers.

Batter hits a foul ball that is over the stands, player reaches into the stands to catch the ball, and a fan intentionally prevents the player from catching the ball by knocking the ball out of player's way. The ball was in the stands, so the fan did NOT reach over onto the field to touch the ball, but did so in (say) the second row of bleachers.

Would this be anything other than just a foul ball?

Thanks for your time.