Please help! Request of Pete Seeger's version of a song...

Hi everyone!

Well, recently, I have really been trying to learn this part of Pete Seeger's "end-tune" to Old-Joe-Clark, but I have been having a extremely hard time hearing it out. I was able to decipher the first ~5 seconds of it (which is a lot of hammer-ons and pull offs on the 3rd string second fret, and the 4th string second fret), but then have no idea to play the rest, like he does, in frailing.

Here is a recording from Prague, 1964, of him playing this: youtu.be/jyMFrVaPOS8?t=808. The section ends at youtu.be/jyMFrVaPOS8?t=852.

Embedded video:


That is when he starts his "end-tune" (as I call it), to wrap up old-joe-clark. I know, for sure, that he is using his thumb and middle finger at one point to play very loud and fast, as shown here at a short excerpt of a Australian performance of the same "end-tune":



So, does anyone here know if they can help out with deciphering this amazing tune? I really wanted to learn it, but I have been having a major block on it for a while now.

Thank you everyone! Any advice or feedback is very appreciated!

-Russ A.