High Overlord Saurfang says: Make haste! The warchief awaits!
Saurfang strikes Malfurion
Head due west, just southwest out of town. Malfurion is fighting Sylvanas! Corpses of Orgrimmar Grunts are nearby. Varok Saurfang approaches the archdruid from behind...
Reaching Saurfang
High Overlord Saurfang says: The warchief faces Stormrage alone! I must...
Varok tosses his weapon at Malfurion.
Malfurion Stormrage says: ARGH! Saur...fang?!
Sylvanas Falfurion and Saurfang
Sylvanas walks to the wounded archdruid. Varok falls to his knees in remorse at his action.
High Overlord Saurfang says: A dishonorable blow. I... regret it.
Lady Sylvanas Windrunner says: Regret nothing. You did well.
High Overlord Saurfang says: It was not my place to interfere.
Lady Sylvanas Windrunner says: My victory was inevitable. He was merely wasting my time.
Lady Sylvanas Windrunner says: Finish him and be done with it. Take a moment, if you like... then take his head. Meet me at the World Tree.
Sylvanas mounts and rides away.
Malfurion Stormrage says: You have led... your Horde... in service... of death. You will... regret this day...
Tyrande Malfurion and Saurfang
Tyrande appears over a hill and runs to Malfurion.
Tyrande Whisperwind says: Malfurion! No!
Tyrande Whisperwind says: You did not kill him, orc. Why?
High Overlord Saurfang says: I struck without honor. I did not deserve to end him.
Tyrande Whisperwind says: The entire war is without honor. How dare you spill so much innocent blood... for nothing!
High Overlord Saurfang says: Not for nothing. We spill blood so that the Horde will endure.
Tyrande Whisperwind says: Because you spared Malfurion, I will offer you a choice.
Tyrande walks closer to Malfurion and aims her bow at Varok.
Tyrande Whisperwind says: Attempt to stop me from taking him away, and die... or remain there, kneeling in the dirt, and live.
High Overlord Saurfang says: You have a choice as well. Take him to Darnassus and both of you will fall when we conquer it... or flee somewhere far from here, so that you both survive.
Tyrande and Malfurion retreating
Tyrande summons the light of Elune and begins healing Malfurion as Varok walks away.
High Overlord Saurfang says: Come, champion. We must follow our warchief to... victory.
Tyrande uses her Stormwind Hearthstone to teleport Malfurion and herself to safety.
Sylvanas hears the weak coughing of a dying night elf, Delaryn Summermoon, and turns to her.
Delaryn Summermoon: Why?
Delaryn Summermoon: Why? You've already won.
Delaryn Summermoon: Only innocents remain in the tree.
Sylvanas Windrunner: This is war.
Delaryn Summermoon: No... This... is hatred... rage.
Delaryn Summermoon: Windrunner, you were... defender of your people. Do you not remember?
Sylvanas kneels down, pulls Delaryn's face up to her, and leans close to her ear, whispering.
Sylvanas Windrunner: I remember... a fool.
Sylvanas recollects her fateful encounter with Arthas Menethil, the Lich King, in Quel'Thalas. She and a handful of rangers are launching bow shots at the invading undead. A mother elf with her daughter stumble to the ground near Sylvanas, who pulls the mother to her feet.
Sylvanas Windrunner: Take her! Run!
Arthas, astride Invincible, appears with his army, rushing toward the line of defense. Sylvanas spares a glance at a defender and springs into action, landing strike upon strike against an innumerable amount of undead. Pulling out her daggers, she intends to land a blow on Arthas, when he unsheathes Frostmourne and runs her through. Tears fall from her eyes, the streaks burning into her skin as Frostmourne takes her soul. She looks at her lifeless body on the ground before spotting the mother and child off in the distance. They too did not survive the attack.
Sylvanas Windrunner: Life is pain. Hope fails. Now you understand.
Sylvanas, still whispering into the ear of Delaryn, pulls back. Tears fall from Delaryn as Sylvanas looks impassively at her before breaking into a smile. She wipes a tear from Delaryn's cheek.
Sylvanas Windrunner: Don't grieve... you'll soon join your loved ones.
Delaryn Summermoon: I grieve for you.
Sylvanas's smirk is wiped from her face.
Delaryn Summermoon: You've made life your enemy. And that is a war you'll never win.
Delaryn Summermoon: You can kill us... but you cannot kill hope.
Sylvanas turns to face Teldrassil before looking back at Delaryn.
Sylvanas Windrunner: Can't I?
As Delaryn stares at Sylvanas in horror, she turns Delaryn's head to look in the direction of Teldrassil.
Sylvanas Windrunner: Burn it.
Sylvanas turns her eyes, then her whole body in the direction of Nathanos and Saurfang, upset that her order was not carried out. Nathanos looks at Sylvanas as if to confirm what he heard.
Sylvanas Windrunner: Burn it!
Nathanos starts to move. The catapults are loaded with burning projectiles and start firing on Teldrassil, landing strikes on the tree. As Delaryn breathes her last, she sees Teldrassil aflame, and Sylvanas on the beach staring at it.
On the other side of the cutscene, Delaryn is dead and Teldrassil burns. Check in with Sylvanas one final time:
The aftermath
On complete
Lady Sylvanas Windrunner says: When I sent you on this mission, I did not foresee this outcome.
Lady Sylvanas Windrunner says: Our attack was meant to end a war before it began... To capture an enemy's home and annihilate their leaders in one stroke. To inflict a wound that would bleed the Alliance dry.
Lady Sylvanas Windrunner says: We have only partially succeeded. The Alliance will retaliate. They will come for us. For me. For you.
Lady Sylvanas Windrunner says: But they ARE bleeding. Their anger will prove a weakness, not a strength, in the war to come.
Lady Sylvanas Windrunner says: Rest while you can. Prepare for the battles ahead. I will have need of you.
Sylvanas, Nathanos, and Varok walk inland, not looking back.
Killer Queen
[War-Torn Reins of the Undercity Plaguebat]
20
[110] No Small Mercy, 
[110] The Guidance of Our Shan'do.
I am ready.
Patch 8.0.1 (2018-07-17): Added.