Illegal Substitution

[SC Ump]

NFHS (but I think all are the same.):

In the top of the third, S1 bats for B1 and S2 bats for B2. In the bottom of the third, B1 and B2 re-enter.

In the bottom of the fifth, S2 enters to play defense for B1. The opposing coach notifies the PU of the illegal substitution (a) after S2 has taken position on the field or (b) after S2 has made a play on the ball. In (a) and (b) S2 is restricted to the dugout for the remainder of the game.

In either case can B1 take her defensive position or is she considered to have left the game for her second time?

I think by rule, even in (a) that the coach would need another unused sub to fill that spot... but I just never remember it being discussed.