Free throw violation

[mlancast]

You gotta call the violation. Team A may not have a player back to defend against a quick "snow bird" based upon the way team B was lined up for the free throws. A definite advantage could be gained by this move.

As far as not breaking the plane....
Suppose A2 is in the 2nd spot next to B1 for the free throw, and then spins behind B1 upon release to try and gain inside position for the rebound. Even though he/she didn't brake the plane of the lane, you gonna let this go??