by SnocatzDad » Wed Jan 19, 2011 1:13 pm
A and B are not tied to each other, they are both tied to the spot in the lineup that A started the game in.
So if A is batting 4th, when B subs for A, B is now batting 4th and A can reenter at the 4th spot later. You could sub C for B, then C would be batting 4th. You could still re-enter A to the 4th spot in the lineup because she is tied to that spot, not to player B.
Re-entry is a great way to get a fast kid to run the bases for a slow kid that has managed to get on base, but still be able to bring the starter back defensively once. If you have a deep bench(and some good hitting but slow starting fielders) I'd suggest doing this early rather than waiting for them to get on base in the bottom of the 7th. Better to be up a couple runs because of good baserunning in the early innings, rather than saving your subs to the last minute.