If the table notified the officials while the ball was in the air (sounded the horn), the ball becomes dead when the free throw ends. Any subsequent contact by A1 would be ignored unless intentional or flagrant.
If the ball was still live when A1 contacted B1 on the rebound, it would just be a common foul. You can't penalize A1 or the coach with a technical foul because A1 is not disqualified until the coach is notified by an official, who must be notified by the table.
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