His jaw twitched as a crimson rivulet slid down his nose, the slices on his cheeks tiny lines of fire crisscrossing his pale skin. The screech of birds in the trees above, angrily cawing at the pair to evacuate their territory, was just icing on the cake. The Kiffar growled under his breath and tightened his grip on his saber. He swiped at the trail of blood from his forehead.
He hated this place.
Terran drew on the Force as he lunged forward, his blade a blur of ochre fire, and Korroth responded in kind. The cadaverous Pau'an stepped into the attack, his own emerald saber deflecting the slash with ease, shunting it away. The Arconan side-stepped to his right, but the Odanite mimicked the Kiffar's footwork, thrusting with his own blade. Terran's lightsaber twirled to intercept, a movement so fluid and precise it would have seemed sedate were it not for its preternatural speed; but the Pathfinder's wrists were quicksilver and he struck back with a rapidity that defied sight.
Verdant plasma struck sparks against ochre flame. The Force-born ferocity of the blow reflected in the Pathfinder's eyes and caught the Kiffar off guard. Terran stepped back and scree shifted beneath his boots. It was only for an instant, when years of well-honed instincts warred with the Jensaarai's precarious footing, but it was enough. Korroth exploded. His hands became a torrent of deadly green light. His emerald blade beat against Terran's saber, a staccato rhythm that had been the heartbeat of the Old Republic itself. Blade met blade in a blur of coruscating fire. A half dozen sharp retorts that screamed of bonds breaking. A dozen sparking strikes that could sunder an alliance.
Then the Kiffar's lightsaber shifted. The movement was miniscule, the natural result of the island's humid, salt-kissed air. It was a centimeter at most, unnoticeable, unremarkable. And when the Pau'an struck, it knocked the blade from Terran's sweat-slicked palms.
The Arconan recoiled from the Jedi, leaping back instinctively. He ripped the dun duster from his back, palming a small cylinder with his left hand as he flung the coat towards the Odanite with his right. The Kiffar drew the blaster at his hip as the towering Pau'an sliced the duster down the middle. Terran let off a salvo of blue bolts and Korroth's blade struck in a dizzying spiral, ricocheting them in several directions. He moved forward, undeterred, and Terran snapped off a few more blasts as he retreated. The Pau'an blocked them all, even as his breath grew short.
Terran grit his teeth and let loose another salvo. The Pathfinder's hands moved without thought and the Arconan seized the moment. He tossed the cylinder towards the Jedi and clenched his eyes shut as the blade tore through it. Then a loud pop filled the clearing as the grenade burst, bathing the pair of combatants in adhesive.
The Kiffar opened his eyes, taking in the sight of the cadaverous Pau'an literally looking down at him in rage and disbelief, covered in glue. He had been abandoned and raised by strangers. He had watched friends die. He had killed former allies. Not laughing was still the hardest thing he had ever done. He managed, barely. He only had moments to plead his case.
"Listen, Korroth…" Terran began. "I know you're angry. You think I've betrayed the Lotus. I get it. But we're stuck here, at least for a few seconds, so do the Jedi thing. Listen. And use the Force."
The Jedi's eyes were chips of black ice, but he met the Kiffar's gaze.
"I run Port Ol'val. The entire asteroid was trashed by invaders. Our people are starving. We're still diverting food and supplies to the Lotus. I've risked my life smuggling undesirables to Kiast. I'm not a Sith. And you're going to have to trust me - Thayer isn't either. No matter appearances, he's on our side. If you're half the Jedi Turel claims, you know it's true."
As the adhesive broke down, the Kiffar could practically see the wheels turning in the Pau'an's domed head. Finally, Korroth gave a nearly imperceptible nod.
Terran sighed in relief and took his first deep breath in what felt like years. "So, want to help me catch some One Sith?"
The Pathfinder quirked a single brow and bared his jagged teeth. "Lead the way."
Just then a bird swept down and pecked at the Kiffar's tousled hair.
He really hated this place.
Syntax
From a flow perspective, this section would be better served being broken up somehow, mostly due to: "sandy coast and bushes and shrubs grew". This tripped me up mentally.
Story
This is confusing to the reader. You're referencing the datacard from Oricon leading him to Ahch-To, but then mention Club Vertica being a disappointment. No mention of why he had gone there.
You threatened to have too little in the way of direct conflict and combat between the characters here. It's a pacing thing, really. The story here is the match-up between them, and you only have 2 posts of your own and 1 of your opponent's with which to tell it, locked at 750 word limits. There should be more than just a verbal exchange with a saber across Terran. However, you managed the tension of it well and tied it strongly to a plot thread that slithers from far beyond the confines of this post. That's something you did very well and somewhat makes up for this lacking.
Realism
In the ACC, Droids only have the functions listed on their description or any enhancements they have. Detecting power signatures isn't on the list of things this device does, nor does it have any modification slots.