A quick detail from last game between F.C. Barcelona and Real Madrid, to show how a team can read the defense and adapt to get advantages.
FCB know how Real will play ball screen defense, helping/bumping from the opposite side against the screener's roll, we saw it here some time ago, and they are using some moves to punish that kind of defense.
One of the sets they use often is the double high screen, in which, as we can see in the video, both bigs are rolling to the basket, so if the opposite side big's defender helps against the roll or the penetration, there will be a good option to receive the pass inside, or, very important, an advantage for the offensive rebound.
If the last defender helps inside, they will punish this help with the pass to the wide open shooter.
Let's take a look: