No, there will not be a sequel, this is going to be a one and done story.
Merlyn Global, past
Before Malcolm's sword could reach Oliver, someone grabbed his arm and flipped him on his back, far away from Oliver. The hostages looked over, relief coursing through most of them as Barry offered a hand to Oliver, which Oliver accepted.
"Thanks." Oliver said, picking up his bow as Barry pulled him to his feet.
"Thank me later." Barry said as Malcolm got back to his feet, sneering at them.
"You've interfered for the last time Mr. Allen." Malcolm sneered.
Suddenly, Thawne blurred over and Barry barely had time to turn before he was speed tackled out of the way. Oliver turned his head and watched as two blurs disappeared out the shattered window.
"Barry!" Oliver and Diggle cried.
"Worry about yourselves!" Malcolm snarled and Oliver turned back to Malcolm, barely having time to bring his bow up to block Malcolm's sword.
Star Labs, present
Oliver, Joe, Cisco, and Wally took cover behind the desk as Black Siren screamed, unleashing her power on the room and causing damage to the machinery around the room.
"Give me your gun Joe!" Oliver barked and the detective gave him a 'are you crazy' look.
"I need to defend myself against these crazies!" Joe protested.
"Give me the gun, get out of here, take Iris and William with you! Let us handle this!" Oliver ordered.
"Sounds like a plan to me!" Cisco agreed with Wally nodding.
"Dad, do it." Wally pleaded.
Reluctantly, Joe took his gun out of its holster and handed it to Oliver. Oliver took it and nodded at Cisco and Wally.
"On my signal." He said as the screamed stopped.
After a moment, Oliver jumped up, opening fire on Talia and Black Siren. Joe jumped up and fled as Cisco jumped up, shooting out two blue beams out of his hands as Wally sped out from behind the desk.
Merlyn Global, past
"Get them out of here now!" Diggle barked at Quentin, gesturing towards The other hostages.
Diggle didn't give the detective a chance to respond, pulling out his gun and firing at Malcolm as the archer stepped away from his fight with Oliver briefly to avoid the bullets. Malcolm reached back into his quiver, pulled out and notched an arrow before firing. Diggle was hit in the shoulder with the arrow, falling back with a scream of pain, his gun clattering to the floor in the process. Enraged at the injury to his friend, Oliver fired an arrow at Malcom, who easily caught it.
"Did you really think it would be that easy Oliver?" Malcolm asked with a smirk.
With a roar of rage, Oliver rushed at Malcolm, whirling his bow like an escirma stick. Malcolm swung his sword and bow met steel in another clash of weapons.
On the streets bellow, civilians looked on in shock as two blurs sped around the streets. Barry slugged Thawne, whose head whipped to the side as Barry sent an uppercut towards him. However, Thawne sped out of the way before speeding behind Barry, attempting to restrain him. However, expecting this, Barry whirled around, punching Thawne in the face. Thawne was sent crashing into a café table and people stood up, realizing those blurs were people as Barry sped in front of Thawne. However, he vibrated himself so no one would recognize him when this was over.
"It's over Thawne," Barry said in his disguised voice, "Give up and come quietly."
"When I'm dead!" Thawne snarled, speeding back towards Barry.
Star Labs, present
Talia dodged the bullets and lunged at Oliver, the former student and teacher exchanging blows. Oliver grabbed her arm and flipped her over onto the floor, but she brought him down with her. She knocked the gun out his land and kicked him in the chest, sending him flying. His back hit the desk and he grunted as Talia stood up, notching an arrow as she took aim at Oliver.
"This is for my father." She sneered before she fired.
Black Siren screamed, sending Wally back on his back, his ears ringing. Cisco fired his blue beams at her but she screamed, the two powers meeting in a blast of power before exploding, sending the two Metas to opposite ends of the room. Cisco hit his head head, knocking him out cold.
Oliver dodged the arrow as he jumped on his side, grabbing the gun. Turning on his side, he fired at Talia, getting her in the foot and the kneecap. Her momentary hesitation of pain was all Oliver needed. Oliver fired three times, getting her in the chest. Talia stumbled back, dropping bow before falling on her back, blood pooling out of her body.
Oliver stood up, breathing heavily, gun in hand when he heard a sarcastic laugh.
"Not bad, you killed the daughter of the demon. But you still have to deal with me." Black siren said, a sadistic smirk on her face.
Oliver raised his gun and tried to fire but only heard the click of his gun.
"Looks like you're out of bullets. And out of luck." Black Siren smirked before screaming.
Merlyn Global, past
Oliver groaned as he lay on the ground before Merlyn kicked him, causing Oliver to cry out in pain.
"Don't struggle, there was never any other outcome," Malcom said, raising his sword above his head as he prepared to deliver the killing blow, "You were a worthy opponent. I'll try to make this quick."
"Stop!" Malcolm paused, looking over to see Tommy, trembling as he aimed Diggle's pistol at his father. "Get away from him or I'll shoot!"
"If you were going to, you would have done it by now." Malcolm pointed out.
"Malcolm, please don't do this!" Moira begged and Malcolm smiled coolly.
"I told you what would happen if you ever betrayed me Moira. But besides that, he knows too much. He poses too great a threat to my plans. As do you all. Don't worry Moira, you'll all be seeing Oliver again soon enough." Malcolm said with a sadistic smile.
"Survive."
With his father's final message to him flashing through his head, Oliver looked over and quietly reached over. Grabbing an arrow on the floor, Oliver sprang into action. Taking advantage of Malcom's distraction, Oliver sent a powerful kick to his legs. Malcolm was knocked off his feet and onto his back. Taking full advantage of Malcolm's surprise, Oliver lunged forward, stabbing the arrowhead into the side of Malcolm's neck. As everyone watched, Malcolm gasped in pain and shock as Oliver drew the metal arrow head across Malcom's neck, slitting his throat. Oliver shakily stood up, holding the bloodied arrow in his hand as blood pooled at his feet, Malcolm gasping for breath.
"Thank you for reminding me what I am fighting for," Oliver said, tossing the arrow to the floor, "but my father taught me how."
It was with those words from Oliver that Malcolm Merlyn took his final breath.
Star Labs, present
Before the scream and it's sonic power could reach Oliver, suddenly, time seemed to stand still. Then, the scene, Oliver and Black Siren, Wally and Cisco's unconscious forms, Julian and Talia's dead bodies, all the damage, it all faded form existence.
Merlyn Global, past
Oliver breathed heaving as Moira walked over to him, Thea and Laurel trailing behind her. Tommy lowered his gun as he stared at his best friend, not sure he really knew him anymore. Quentin helped Diggle to his feet, the younger man wincing at the arrow in his shoulder.
"You okay?" Oliver asked, looking over at Diggle.
"I'll feel a lot better once we get this arrow out of my shoulder," Diggle told him and Oliver nodded, "What about Barry?"
One the outskirts of the city, Barry suddenly stopped in his fight with Thawne. Thawne stopped as well, noticing something was wrong with Barry. Barry suddenly fell to his knees, screaming. This wasn't a scream of pain. No, this was a scram of full, pure agony, blood murder scream. Barry suddenly glowed, yellow speed force energy surrounding him. The energy shot into the sky, appearing as though it were a lightning bolt. Then, it faded, leaving only Barry who fell to the ground, out cold.
Thawne sped over to him, frantically checking for vitals, which he found. Good, he still needed him alive for his plan to work.
"I sense no speed force energy coming form him." Gideon said and Thawne's blood ran cold.
"How is that possible?" Thawne demanded.
"I am not sure." Gideon said in her robotic voice.
Thawne roared in rage before speeding off, leaving Barry's unmoving form there.
One more chapter after this.