Episode 6x09 Snippets

1)Jacob and the Man in Black are connection with Richard Alpert
2)Richard Alpert has met MIB in his Flashback
3)Richard Alpert has met Jacob in his Flashback
4)Jacob and Richard Alpert are involved in a fight which involves a "special" knife
5)This fight occurs in the 1800's

Source: SpoilerTV

source: DarkUfo