I must return home, but Zelling has a plan to hide our actions from Sylvanas' eyes.
The Banshee Queen must not learn of what transpired here, for it would put far more lives at risk than our own.
Notes
Upon accept
Baine blows a horn and runs to the center of the deck.
Thomas Zelling says: That took longer than expected. I was concerned you had been caught.
Baine Bloodhoof says: There were... complications... but we are ready to depart.
Thomas Zelling says: Then let's not waste any more time. <Class>?
Speaking with Thomas
As a Tidesage, I can call upon the powers of the sea to guide this ship to our destination.
Say the word and we will set sail.
Set sail to Theramore.
Thomas Zelling says: Seaward winds, fill our sails! Guide our ship through oceans true!
Thomas uses his magic, and the atmosphere changes.
Cinematic
It is nighttime. Jaina's ship waits by one of Theramore's docks, bow pointed out away from the ruins as cool ocean mist slightly obscures their surroundings. Jaina, with Shaw behind her left shoulder, are alone on deck, waiting for The Swift Vengeance to come up along the port side. As the Horde battleship slowly solidifies into view from the mist on her approach from the opposite direction, Jaina tightens her grip on her staff.
The Horde vessel practically drifts into position, portside to portside, and Baine lowers a gangplank with a thump. As he crosses over, his massive body obscures a man following closely behind him. He greets Jaina as he steps down onto her deck.
Jaina Proudmoore:Theramore is gone. You did not ask me here to reminisce.
Baine Bloodhoof:No. I have come to return one who was lost.
He turns and gestures towards his companion who steps forward, eyes hidden by his tricorne hat. He is dressed in Kul Tiran clothing that has seen better days, and as he raises his hand to politely remove his hat, it's clear by the skin tone that he is undead.
Jaina is stunned when she sees it's Derek Proudmoore, her older brother raised as a Forsaken. She becomes upset, misunderstanding Baine's intentions.
Jaina Proudmoore:Derek... my own brother.
She steps towards Baine, her anger continually mounting as she speaks.
Jaina Proudmoore:I had thought better of you, Baine.
Realization dawns on Jaina's face as she sees that Derek really is his own person; only family would know those words. She looks to Baine to ask one simple question.
Jaina Proudmoore:Why?
Baine looks at her sadly.
Baine Bloodhoof:The Horde has a sickness in it.
Jaina steps up to him as he continues.
Baine Bloodhoof:We wage war, while the Earth Mother dies. We have forgotten what truly matters,
Baine accentuates his heartache by bringing his hand to his chest as he speaks.
Baine Bloodhoof:and my heart can bear it no longer.
Jaina Proudmoore:Sylvanas will kill you for this. And... she may not stop with you.
He replies philosophically.
Baine Bloodhoof:No life is worth living, if we cannot be true to our nature.
He turns away to the gangplank. Jaina's face is a look of worried concern.
Baine Bloodhoof:I return home, to take what solace I can in my family.
He briefly looks back over his shoulder at her as he continues, looking towards Derek before stepping up onto the gangplank to cross back over.
Baine Bloodhoof:I hope you take solace in yours.
He gets a few steps before Jaina calls out to him.
Jaina Proudmoore:Baine...
He pauses, and the siblings look towards his back.
Jaina Proudmoore:thank you.
He acknowledges her heartfelt gratitude with a soft grunt, and disembarks back onto The Swift Vengeance. Derek and Jaina look to each other.
The ship now appears in Dustwallow Marsh. Speak with Baine to finish the quest.
Upon completion
Baine Bloodhoof says: I will not forget what you have done this day. Take care, <name>.
Baine leaves the ship, mounts his wyverns, and flies towards the mainland.
A Bitter Reunion
[Radiant Azerite Core] (750x 
[Azerite])
[War Resources]
34
[60] Under Lock and Keys & 
Set sail to Theramore.
Patch 8.1.5 (2019-03-12): Added.