Is this obstruction?

[Larry1953]

A rule question not regarding the specific play. It has been said that LL does not have "in the act of fielding" clause for obstruction. Yet the official rule book cites what I had previously quoted giving the example of an IF who dove and missed the ball and subsequently interfered with the progress of the runner. It says once the ball has gone past him, he is no longer in the act of fielding. So that is basically what I am asking. If LL does not have an act of fielding clause, why was such a specific case example put in its rulebook? I know the fielder can't be expected to "go poof" but the case example seems to address that issue by saying, once the ball has gone past him, not once he has time to get up and get out of the way.

I ask this because I would like to volunteer to umpire youth league next year and I would like to get the call right. I last did it about 15 years ago and it is a very daunting experience indeed. I know a blew a few calls, but I always tried to hustle to get in position, so the coaches cut me some slack.