Being determined you WILL save Miraak for purposes, If you do not the story will not continue. You are standing before the First Dragonborn as he speaks.

”And so the First Dragonborn meets the last at the summit of Apocrypha.”

He paused, before using the dragon aspect shout.

”MUL QAH DIIV!”

“Kruziikrel! Relonikiv! Now!”

That was him calling to his dragons, he grins widely under his mask to see what you would do.