intentional leaving the playing surface

[Hardwood]

Player A1, while dribbling, drives to the baseline and jumps toward the OOB area and before touching the floor, throws a pass behind the backboard, along the baseline to A2 in the opposite corner. A1 lands out of bounds and in a) returns immediately the playing area, or in b) remains out of bounds and runs the baseline toward the opposite corner. This is clearly a set play designed to deliver the ball to A2. Violation for intentionally leaving the playing surface?

Hardwood