Ok it wasn't witnessed by any characters or took place before the story starts.
Wiki says
As a False Dragon, he was captured in a great battle near Lugard, trying to move his army from Ghealdan to Tear. Aes Sedai died in the battle defeating him.[1]
I guess that's what they dramatized in a bogus way. Well no he starts out in chains but escapes. They just made it up I guess
Ok it wasn't witnessed by any characters or took place before the story starts.
Wiki says
I guess that's what they dramatized in a bogus way. Well no he starts out in chains but escapes. They just made it up I guess
Yeah that isn't in the books. So the whole thing was just to showcase Nynaeve even though she's unsufferable.
Pretty much sums up the whole show.