Here is what I’ve got for the Phasma scene thus far. I’m actually pretty satisfied with my first attempt:
As her stormtroopers hurried to set up a repeating blaster that could take out the scout walker, Phasma strode across the hangar with her rifle raised. Rose sent a hasty volley of shots her way, but the one shot that landed on target merely ricocheted off of Phasma’s shining armor to no discernible effect.
As Phasma rushed their position, Finn noticed that one of the executioner’s axes lay on the deck where its wielder had abandoned it. Finn scooped it up, slashing down at Phasma’s head as she aimed her rifle. She saw the blow coming and raised her blaster to intercept it.
The ax cut her rifle in two. Finn grinned as his former commander tossed the useless halves of her weapon away. But before he could press his advantage, Phasma yanked a short baton off her utility belt, which he knew was specially crafted with a unique microscopic structure. A quick whiplike motion extended it into a double-ended spear as long as she was tall.
“You were never anything more than a bug in the system,” she told him, voice dripping with contempt.
“Then I’m going to crash the whole thing,” Finn yelled back, taking a wild swing with the ax. She blocked it and nearly ran him through, forcing him to give ground. Behind her, the scout walker was taking apart the hanger piece by piece, the stormtroopers forced to flee from its murderous fire.
Growling, Phasma whipped her spear at Finn, alternating vicious jabs with slashes aimed at his head, chest, and legs. He parried with the haft of the ax, sparks leaping with each impact, and looked for an opening in her defenses.
But there wasn’t one - she was both faster and stronger than he was. It was all he could do to keep the ax between the two of them, as she rained blows on him from every direction, driving him steadily backward and forcing him to dodge to avoid tripping over the bodies of stormtroopers killed by the initial blast.
She was maneuvering him toward a shaft in the hangar floor, he realized - probably a lift for bringing heavy equipment up from a lower level. Flames were licking out of the opening.
Finn tried to dodge sideways, but Phasma intercepted him. He blocked her attack at the last possible second before she split his skull open. Their weapons remained locked in place.
“You were always disobedient,” Phasma said, pressing him back. “Disrespectful. Your emotions make you weak.”
“No,” Finn replied. “They make me strong.”
With a savage yell she kicked him backward, into the heat and wind boiling up from the Supremacy’s depths.
But a moment later he emerged from the flames, riding atop the turbolift platform he’d landed on and aiming a vicious uppercut with his ax at his attacker. The blow knocked Phasma down and split her mask open. Through the shattered chrome Finn spotted a light blue eye in a pale face.
Finn climbed up from the turbolift and approached Phasma to finish her off as she lay on the floor. But then a group of stormtroopers emerged from the wreckage all around them, weapons pointed right at him. Phasma grabbed her spear off the ground and got to her feet.
Where were Rose and BB-8 when you needed them?
“Put the weapon down, FN-2187,” came a familiar voice - that of nine twenty-six from the lift.
Finn lowered his weapon, but refused to drop it. He knew he needed to stall for time for as long as possible. He faced Phasma.
“You called for order,” he said. “You beat us down. But when your shiny neck was threatened, your devotion to the First Order was abandoned.”
Phasma’s visible eye blinked rapidly. The stormtroopers around them shifted uneasily. Finn hadn’t expected this to actually work beyond stalling.
“The evidence blew up at the base, but you and I know the truth,” Finn continued. “When I put a gun to your head, you shut down Starkiller’s shields! What would your masters do if they found out?”
Fear spread across what Finn could see of Phasma’s face.
“Who would believe a story like that?” she asked, her voice shaking.
Apparently, her own troopers could. They began to exchange glances with each other. Some even lowered their blasters. Phasma’s eye darted from one soldier to the next, detecting the sudden shift in their demeanor.
“I believe him,” said nine twenty-six. “He was always a-”
Finn’s former comrade never got to finish what he was saying. As he spoke, Phasma had launched herself at a blaster on the floor, opening fire on her own men with impossible speed and precision. Seizing his opportunity, Finn charged at her, aiming the swing of his ax directly at the blaster in her hand.
The energy filaments sliced through both the blaster and her hand, cauterizing the open flesh it left behind. Phasma screamed in pain, and Finn went in for a second attack - only this time she blocked it with the spear in her remaining hand. His weapon shivered and then broke. He discarded it to the side, now defenseless.
He managed to stop the spear as she brought it down on him, but then she slammed him backward, landing in the pile of dead stormtroopers around him. He saw now that she had not left a single stormtrooper standing.
“You were always scum,” she spat.
“Rebel scum,” Finn replied coolly.
As Phasma raised her spear with one hand, Finn spotted a heavy assault blaster left behind by a stormtrooper she had just killed. As he pointed it at her chest, Phasma’s surprise momentarily froze her in place - but Finn wasn’t stopping for anything. He fired it, sending her body soaring through the air before landing hard. Instantly the unstable floor collapsed around his former commander. Phasma fell, vanishing into fire.