He's there. He's suited up. He's capable of movement as he walks out and greets the players coming off the court at every timeout. Other than that, no idea why he's just ... there.
Could be some issue between him and the coaching staff?
Seems like he's not his cheerful self on the bench (happy for the guys, swinging pistols, etc...).
Perhaps he is not 100% healthy?
(That could get you down as well)