The Hawks are below .500 this season, and their defense is why.
I felt like the second Grant Williams three with 3:15 left was the dagger. They sent a double at Tatum... Hunter and Bogdanovic. The double isn't nearly aggressive enough, but at least Hunter is making an effort. Trae Young was sagging way off of Pritchard in the weakside corner... that's fine, that's a difficult pass to make. Huerter is similarly sagging off of Smart, one pass away at the top of the key. Less fine, but Hunter covers him by disrupting the passing lane. After Grant occupies the playside corner, Gallinari is forced to pull double-duty - he has to cover Rob in the paint while also being ready to close out to Grant, and he just doesn't have the footspeed to do that. He winds up in no-man's-land between the two, not taking either away. Still, I want to highlight one thing - this might have still worked out for them had Bogdanovic been doing his job, defending Tatum aggressively and disrupting passing lanes. Instead, he's just sort of... standing there, not doing anything. The pass to the corner is easier than it should have been and Grant turns the lights out.
Part of this is personnel, and part of this is effort. No amount of voodoo magic is turning Gallinari into a good defender at this point in his career. But watching Bogdanovic do nothing on the double team was actually painful. That just isn't the effort a team needs out of its guys in crunch time.