[Freddy]

If the sitch is as I think it is, that is, on a throw-in, 9-9-3 may apply:
A player from the team not in control (defensive player or during a jump ball or throw-in) may legally jump from his/her frontcourt, secure control of the ball with both feet off the floor and return to the floor with one or both feet in the backcourt. The player may make a normal landing and it makes no difference whether the first foot down is in the frontcourt or backcourt.
Since there is no team control during a throw-in, and team control had not yet been established in the frontcourt, his/her control of the ball in the backcourt would not have been a violation due to this exception.
Is this applicable to the situation you are trying to describe?
(I'm not sure this answered the question)