I assume you’re talking about the first play. I know ppl hate Russ, but I look at that and he’s moving with Kemba until he peeks over and sees Tatum getting a step on his dude then stops and only faces him. He doesn’t turn his back for a rebound, no boxing out or nothing. My thought there is him trying to help and thinking that someone else would just pick up his man. Not a great defensive strategy either
It's on both plays. He's standing in the key guarding absolutely no one in both of them.
In that first play, you can't say he's trying to guard Tatum cause he never tries to get in position. He doesn't close on either side, just just stands right behind the other defender. That's a horrible place to be, it's not how you play help defense cause it puts zero pressure on the offensive player who is still operating with total freedom. And you can see him ball-watching and losing Kemba long before Tatum gets a step, it's classic Russ to slow down and look for the ball whenever he crosses the key in order to check and see if a rebound might be coming.
Of course he didn't turn his back, why would he do that before the shot went up?
On the 2nd play he does the same thing. Loses Kemba the moment Kemba crosses the key, but doesn't close out on Tatum at all. He's defending absolutely no one.
And like I said he's been doing this for years. Look at these plays from 2017, last two minutes of a tight game. Where is Russ standing on defense, where are his hands, and why isn't he facing his man?