ASA Co-Ed Rules Interpretation Help

[NCASAUmp]

Without having my 2011 book with me, since the rule has changed this year...

I would say time of pitch, but would have very little from the book to directly back me up.

My rationale is that there are certain requirements of the fielders' positioning that are only required prior to the pitch - the catcher must be in the catcher's box, all other fielders must be in fair territory, etc. By extension, I would say that infielders and outfielders must be in their proper positions by the time the ball is pitched.

Practically-speaking, it's next to impossible for an infielder to have enough time to go from the infield to the outfield (or vice-versa) after the pitch has been released, but before the pitch is batted.