BC or not?

[fullor30]

A1 inbounding passes to A2 who jumps from front court catches ball comes down with one foot front court followed by second foot in back court.

BC violation?

Casebook 9.9.1 A calls for a BC violation should A2 catch ball with one foot down in front court followed by second foot in back court. Don't have case book to reference # but throw in caught in air from A2 leaping from frontcourt to backcourt is not back court.