ASA game situation

[RonA]

OK, Here's the situation. ASA game, Men's tourn, E league (not relevant to situation, I don't think)Long fly ball, obvious foul. As plate ump, I call foul ball. However, ball is caught in area of play by rf (in foul territory) who then slides into out of play area. I rule that since ball was caught, in appropriate foul territory and that momentum of player was what carried him out of play, batter is out.

My question is about order of occurence. Should I have waited before declaring the FB, and did doing so make the catch of the foul ball a moot point?

BTW, game was in last inning, run rule in effect, last out, neither team really playing seriously. (not that it made any difference in my decision process)

Ron