I'll tell you why Nunberg freaked out:

[DetlefK]

He's connected to Roger Stone.

Roger Stone is connected to Wikileaks and Russia.

Nunberg was afraid of going to jail as collateral damage when Mueller makes his move against Roger Stone.

[bigtree]

1. likely he knows he's perjured himself

...and the next appearance's the trap.

[poboy2]

2. He is/was giving the appearance of being willing to go to jail to not expose Stone and Bannon.

[bigtree]

4. who really knows why he's not willing to give over?

...might be because he knows his own goose is cooked because of his earlier testimony.

The talk about going to jail appears, this morning, like forced bravado. He now says he'll cooperate.

[OnDoutside]

3. Well he has admitted Mueller offered him immunity.

[bigtree]

6. he won't get it if they can prove he lied to them

...they'll just squeeze him.

Remember, John Dean wasn't given immunity from jail time, at the end of his Watergate testimony.

[poboy2]

7. He said a lot of things the had to have PO'd Mueller, including that I'd think.

He basically paraded Mueller's strategy as he saw it.
Waving around names and such. Undermining the investigation, etc.
Can't see how Mueller would have that as intentional.

[enough]

5. So how does this help him? NT

[Sanity Claws]

8. It doesn't

He freaked. That means he was not acting rationally.

[TheBlackAdder]

9. What about the traditional reason? He's just a fucking RW loon!