You're on to it, old bud. Here's what I saw happening. I recognized it right away because a very good coach beat me with it in a city final, when I was running the SU 2-3. When UNC reversed the ball from the strong side over to the off-wing, that wing immediately entered the ball back inside to the high post, who made a touch pass to the baseline cutter for a layup/dunk.
This works well because when the ball was originally on the other wing, one defensive guard is covering the ball while the second fronts the high post. So when the offense skips the ball over to the off wing, the weak side defensive wing pops from the hole out to the ball until the guard gets over (yeah, we all know this), and then he slides back down to the low block/buffer area. At the same time, the high post cuts across the foul line to the elbow which is easy because the guard was defending him on the ball side (read: now the wrong side), so the high post will naturally be open for that entry - especially coming to meet the pass. The defensive wing had to leave the baseline open when he popped out, and cannot possibly get back (nobody can) to the low block to prevent/defend the pass there from the high post.
This was especially effective at the end of the game when SU's 6-deep roster was tired, and couldn't hustle over on D. And I guarantee you this was practiced well in advance, and sprung at the right time. It was no accident. So let's face it, friends, Roy beat Jimmy this time. And I think Jimmy was pissed because he knew it.