Backcourt ruling

[ditttoo]

Need the specific applicable rule for high school....

A1 is dribbling up from the backcourt. A1 passes, while in the backcourt to A2. While the pass is in flight, A2, leaves his feet (last in front court), catches pass and lands in backcourt. Pass never breaks the plane of the halfcourt line. Backcourt or not? What's the applicable ruling?

Any specific ruling or reference to case book very much appreciated.

Thanks!