Foul on throw-in after jump violation

[Lotto]

OK, here's the situation. Jumper A1 catches the toss. Violation. After handing B1 the ball for a throw-in, B2 fouls A2. It's now A's ball out of bounds.

Question: Which way do we set the arrow?

Here's what the NCAA rule book says about the situation. After Rule 6.2-2, we have the following:

A.R. 3. During the opening jump ball, A1 illegally catches the tossed ball. The referee
blows the whistle and awards the ball to B1 at the designated spot. How is the alternating-
possession arrow established? RULING: The first legal possession is by B1 on
the throw-in. As soon as the throw-in by Team B ends, the direction of the alternating possession
arrow shall be changed to that of Team A.

Note the wording---"As soon as the throw-in by Team B ends..." Here the throw-in never ended!

The only thing that seems fair to me is to have the arrow pointing to B (as opposed to leaving it unset and having a jump ball on the next tie-up). Can someone give me a rule reference to back this thinking up (other than Rule 2.3, that is...).

Thanks!