"It got tough for us in the third quarter and we quit. That’s what happened."Strong words following a game where your team allowed just a point per possession on the road against a team that ranks in the top five in the league in offensive efficiency. The Hawks shot the ball poorly and rebounded worse (or vice-versa, I wouldn't argue the particulars) but those are both single-game risks inherent with this roster, built around jump shooters and reflecting a long-held, institutional belief that rebounding is not a skill.
With Al Horford out, Marvin Williams is clearly the team's third-best rebounder. Either Tracy McGrady or Vladimir Radmanovic is the fourth-best rebounder. And the team is again near the top of the league in long, two-point jump shots attempted per game. That's not accounting for pace.
If you're going to have fewer than 90 offensive possessions a game and you're going to use 26 of those possessions on long, two-point jump shots, then you're going to have nights where you struggle to score and put tremendous pressure on your performance in the other three factors.