Trey is riffing inbetween the primary chords of this rich groove, and then takes off soloing more up front around 13 mins. Trey just takes off in here, and Page, Mike and Fish accompany his licks profoundly. There's frankly only a handful of jams I've heard from 1999 that even compete with the spirit of this jam. Phish was still trying to win fans back then. Jam cools off around 16 mins, quiets down.
Crowd starts clapping along.
Then it picks up again, and they lock into another sah-weeeet jam. Then nothing except the crowd. It takes awhile to get harmonious. And it ends a couple minutes after it does.