You mess with the Bulls, you get the ejection.
(No, that's not how the saying goes.)
Nene grabbed at Butler's head, like a boxer grabbing his opponent to prepare for a big uppercut, and even appeared to ball a fist at one point. Both players were assessed technicals, but after a review Nene was disqualified for the head contact.
I'm sure the play will be reviewed by the league and both players could face further punishment for the altercation.
Nene left the game with 10 points on just 5 of 15 shooting with four rebounds.