Sub after 2nd free throw

[rookieref2005]

Yesterday, we had a middle school coach that liked to sub for the free throw shooter so he could set up his press. A few times he sent a sub to the bench as we administered the ball on the second free and we obliged on the make and allowed the sub to enter. However, the sub was replacing a player other than the shooter.

The other coach got very upset, saying, "You can only sub for the shooter on the second free throw." In other words, if team A subs after the second of two free throws, the shooter has to come out.

I told the coach that I've never heard of that rule and that I suspect that he hasn't either--it's just what is commonly done.

Can anyone help me out so I know if I was correct?

Can Team A have a sub enter for a non-shooter after the second (of two) free throw (the coach always had the kid go to the table as we administered the second free throw so he wouldn't have to enter between free throws)?

I thought it was OK--it just stretched the game out a little.

Thanks.
The Rook