You may be overthinking this. This is the first day of a conference tournament with back-to-back televised games. I would imagine the coaches and players were instructed to exit quickly so event staff could clean the bench area to get ready for the next game. I'm guessing that applied to related parties sitting behind the benches. That certainly wouldn't have precluded Fran and Bruce from stopping to speak, but my bet is both programs were told to leave quickly, and that's what may have happened.
The officiating and score-keeping crews also are changing at that point.
If you noticed, during Matt's post-game BTN interview Indy and Penn State were both taking the floor for warm-ups.