Player technical?

[BillyMac]

It's a violation.

NFHS Violations and Penalties 9-3-3: A player shall not leave the floor for an unauthorized reason.

However:

9.3.3 Situation D: The score is tied 60-60 with four seconds remaining in the game. A1 has a fast break and is near the free-throw line on his/her way to an uncontested lay-up. B5 running down the court near the sideline, intentionally runs out of bounds in the hopes of getting a leaving-the-floor violation called. Ruling: B5's intentional violation should be ignored and A1's activity should continue without interruption. Comment: Non-contact, away from the ball, illegal defensive violations (i.e. excessively swinging the elbows, leaving the floor for an unauthorized reason) 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. (10-1-8)