what do you mean by their "looks"?
The way the players look at their opportunity to hit the possible shot attempt.
So if your SG got a great look, he thinks his shot will go in most of the time, which happens more when the offense dominates the defense. If your SG didn't get a great look (but takes the shot), the chance of his shot going in is smaller, which happens when the offense is slightly better, equal to, or worse than the opponents defense.
When you play a fast paced tactic and you've got terrible 'looks', aka the chance of the shots going in isn't that big, you will lose possession pretty fast (since you play fast paced, thus take worse looks than slow paced, thus take quicker shots, thus miss more) without even scoring a single point. This will decrease the opponents score a lot.