The team reports that he is complaining of a "stiff left shoulder." The initial report stated that he slept on it wrong and that he would be able to play. They soon realized that he wouldn't be effective and pulled him.
Here's my problem with that. From what I understand, it hurt too much to grab a rebound and later in the locker room he couldn't even take his shorts off. They will be re-evaluating when they get back to Vegas. I hope I'm wrong but it could be more serious than they are letting on.