Whistle from the stands

[JerryLundagard]

Don’t have my rule or case book here at work so I am looking for something to support how the below situation should be administered that occurred in a game last night( boys varsity).

Team A is up by 1 and in control of the ball, with less than 10 seconds remaining in the game. A whistle sounds from the stands with 2.1 seconds left on the clock. Clock stops and Team A player with the ball stops playing. Player from Team B takes the ball from him and dribbles length of the court and lays the ball in. Clock is still stopped with 2.1 seconds.

Officials conference and then decide to allow the basket to count and award the ball to Team A on the endline for a throw in after the made basket. I did not speak to the officials so I don't know the thought process for arriving at the ruling.

Is there a rule interpretation or case book ruling to administer this?