Yeah, it was a little unprofessional but it is a molehill, not a mountain. And Lebron said he actually did stay on the sidelines until time ran out and congratulated Joe Johnson at the end before he headed to the locker room. I haven't seen any video to confirm or deny. It's like people jumping to conclusions on the Raiders knee to the groin video, where he was actually trying to retaliate to a knee against him. Of course, the media conveniently only loops the video starting AFTER the initial knee against him.
video: http://www.youtube.com/watch?v=qN1epji9Xf4 (look about halfway through) Yeah, it's not as bad as people are making it out to be. Still, I thought he was better than that.
He hadn't left the court. They were just dribbling the ball till the time went off the clock...he should have at least stayed on D with his team but it's not as bad as they are making it seem.