[Nevadaref]

Originally Posted by just another ref

9.3.2 comment: Non-contact, away from the ball, illegal defensive violations specifically designed to stop the clock near the end of a period or take away a clear advantageous position by the offense should be temporarily ignored.
The defensive team should not benefit from the tactic. If time is not a factor, the defense should be penalized with the violation or a technical foul for unsporting behavior.

Hold the whistle, let B finish the play. Then call the violation, which will give B the ball back. The play described in the op sounds like confusion, as opposed to unsporting behavior.

That's correct. This is a new case book play. It was issued as an interp on the website last season when leaving the court was changed from a T to a violation.