Substitution

[Hawks Coach]

I, as coach of team A, substitute in 4 players and 3 immediately leave, while the 4th remains on the court and sets up in our press. Coach B and I both notice we have an extra player. I am calling my player off the court and Coach B is trying to get the refs' attention before play begins. Lead waves off Coach B, the trail gives the ball on the baseline to Team B's inbounder, and then the lead T's us up. While this seems like poor game management, I am also curious as to whether this is the right call. According to 3-3-1, our substitute became a player upon entering the court and the player subbed for became bench personnel as soon as the sub became a player. Where does it say how quickly they must leave the court, or whose responsibility it is to have them leave prior to the ball becoming live? Fortunately they missed both free throws, but I was a tad miffed. Don't worry, I held my tongue and threw no chairs - tho I must admit we were sitting on bleachers .