Intense lag!
(it isnt foolish i am going along with the story)
You can
For you can kill them all on where Astrid brings you to the abandoned shack.
This didn't belong on Online discussion so I moved it.
It's a glitch/bug that happens sometimes try reverting to a save before you go battle Miraak.
My bad I got confused I could have sworn there was a Black Book.
I was thinking of Kolbjorn barrow.