AP Arrow

[Burtis449]

Situation: Team A adds a player to their score book. Team Technical foul on Team A. The game starts with 2 foul shots by a team B member followed by a throw-in by B1.

Question: when does the AP arrow get switched? I'd like a rule reference.

I've been told conflicting things by different (respected) officials.
One was that it's a normal AP throw in and the arrow gets switched when the throw in ends like normal.
I was also told that the arrow gets switched immediately after B1 has the ball in his/her hands. The reason being that this is the initial starting of team possession so switch the arrow to A's basket before the ball is thrown in. Rule 4-3 Art. 3b?! What are free throws for a non-common foul in this situation?

Any help would be appreciated.