[bob jenkins]

Originally Posted by Rufus

Not sure this is relevant or not, but USSSA rule 8.08.E (amended September 2008), which addresses balks, indicates that the penalty shall be:

The ball is dead, and each runner shall advance one (1) base without liability to be put out, unless the batter reaches first (1st) on a hit, an error, a base on balls, a hit batter, or otherwise and all other runners advance at least one (1) base, in which case the play proceeds without reference to the balk.

Seems that this indicates it's a timing thing - if you call the balk and the pitch is not delivered as a result runners advance; if you call the balk and the pitch is delivered resulting in one of the above, play on. Otherwise runners advance one base.

Am I interpreting that correctly?

Yes, but that's only two (balk followed by nothing; balk followed by pitch)
of the three possibilities (balk followed by throw)