It was a viscious elbow to the back of the head. But, the tv commentator overreacted a bit talking about malace at the palace and the Ron Artest of old and stuff.
I mean, it wasn't as if he round house kicked him and then started whaling on him. It was deserved of the ejection and deserved of a suspension.
Although, I'm not sure what Harden was doing there. I'm pretty sure it was nothing more than him not payung attention and just bumping into Artest trying to set up for the inbound.
Somebody post the video when it's up.