Masochistic throw-in question

[Amesman]

Lotsa kid hoops tourneys these days and was watching one (probably the problem ... ) Friday night and this happened:

B1 wins battle for a rebound as A1 loses body control and goes splat. No fastbreak underway so the play is whistled dead while Coach A comes out to to tend to injured 7th grader. Teams congregate before their respective benches.

A minute or so later, the shaken up player is walked off the floor and the officials hustle the players back onto the floor since there's been no timeout granted. Since A has the near bench and A2 mistakenly thinks his player hit the deck because he was fouled, he gets in place first, readies to receive the ball from the official and team B slowly trots back onto the court.

Ball is handed to A2 at about the 28-foot mark and he passes to A3 who drives furiously to his nearby basket and gets fouled by B3 in a bang-bang sequence. Tweet. Two-shot foul.

Stop. Officials realize why the play seemed so discombobulated and they seemed in the wrong positions: B should have inbounded, going long — not A. The nearest official stops everyone from setting up for the FTA and announces the ball was wrongly inbounded. Foul is wiped from the book and and play resumes with B inbounding from the previous throw-in spot.

It wasn't (yet) a correctable error per 2-10, but handled correctly?