Joel Embiid finally showed his value to USA Basketball against Nikola Jokić, Serbia

Watch Joel Embiid play enough and his emotions become easy to read. If he’s tossing lazy passes, and ambling around with a stoic face, and collapsing onto the floor every five minutes, well, you can assume he’s checked out. That happens, sometimes, with him — more than it should. 

But those lows are what make his highs so energizing. In those rare…