Trey was, and is, a rather polite guy: parents did a good job with him, so he felt it was’t his place to musically cut in when Bobby was soloing.
Unfortunately, for 30 years, the way Bobby knew it was time to stop soloing and go back to playing chords with that pinky-trill thing was when Garcia ran out of patience and started playing over him real loud.
When this didn’t happen, Bobby doubled down and just kept playing and it got weird. 35 minutes in, the bass player snuck off, ostensibly to pee but he didn’t come back. The audience was confused and a mood overtook the room that can obly be described properly in the German language. Bobby was crying at the end: he just wanted his Garcia.