Intentionally Leaving The Court. Violation?

[GeorgeRef]

Intentionally leaving the court is a violation, correct?

Situation:

Team A makes a basket. Team B immediately calls timeout, and will have the run of the endline when returning from timeout.

Official hands B1 ball for throw in after timeout. B2 then leaves the court on the other side of the lane.

B1 throws the ball to B3 at the free throw line.

Is this a violation for B2 leaving the court?

Thanks.