Illegal Re-entry?

[Sven]

Last night. Boys HS Varsity.

There's a turnover by Team A. During the dead ball prior to the Team B throw-in, A1 comes into the game for A2. B1 violates on the throw-in by moving from the designated spot. (Official signals this with a travel, by the way.) Clock does not start.

Prior to the subsequent throw-in by Team A, A2 reports, timer signals, and A2 is beckoned. A1 leaves the court. Before the ball is at Team A's disposal, the non-administering official (Referee) holds up play.

Floor officials consult; A2 is put back on the bench and A1 is back out on the court. Play continues with Team A throw-in; no penalty.

Handled properly?