Why does this happen to me? :)

[Yep]

I stand corrected!! First of all, when the ball goes directly out of bounds without touching a player - a throw-in violation has occurred. Technically the throw-in has not ended as it was never "touched by a player in bounds" as the definition for when a throw-in ends reads in the rule book.
Unfortunately, as happens many times, I misinterpreted a rule simply because I was not aware of all the throw-in procedures.

So, GIVE THE BALL TO B AND CHANGE THE ARROW!