wait just a minute now.....

[ChuckElias]

Originally posted by Ref in PA
6-4-4 "The direction of the possesion arrow is reversed immediately after an alternating-possession throw-in ends or when the throw-in team violates."

Ok, I didn't look carefully enough. I had in my head that the throw-in team had to commit a throw-in violation. But since A3 violated (by touching the ball while OOB) before the throw-in was complete (by being touched by a player inbounds) Team A loses the arrow. Makes a lot more sense now.

Amazing what you can find if you actually read the rules.