Two outs, everyone leaves field

[Joe3401]

My first post

I was doing a LL Minor A game today, solo. Calling the game from behind the plate. Here's the situation: R1, R2, one out. Batter pops up over shortstop. I get out from behind the plate, call "infield fly, batter's out" and point upward. R2 was on the way to 3rd and R1 stayed. F6 throws to F4 who steps on bag. I don't move (still have my arm up) and everyone (!) leaves the field.

After most of the kids were in the dugout, I pulled the opposing coaches aside and explained how the infield fly rule works and that there were only two outs. I got blank stares (gotta love this level of LL). After explaining the rule to them, offensive coach asked if he can put his runners back out on the bases.

My ruling was that since everyone had vacated the field, the play is over and, subsequently, that half-inning is over.

Did I make the right ruling?

Thanks!