The Dark Side had alerted Legorii to the impending missile, but only just. He hurled himself out of its path, diving toward the back of the room. He tried to cover his head as the rocket ripped through the cantina’s outer façade, sending shards of durasteel and stone down upon him. The blasterfire from the street below subsided.
The Arconan’s ears were ringing. In a daze, he gingerly attempted to roll out from beneath to rubble. He brushed dust and scorched paint peels from his black robes. There was pain in at least a half-dozen places. The bruises and welts would be with him for days, but he was alive. He reached down and pulled his BlasTech rifle from the debris and inspected it. Dinged and dented but functional.
Legorii was far enough back in the now-demolished room that he could not be seen from the street below. He knew it would only be a matter of time before Kojiro made his way into the cantina in search of his corpse. But for now, he had to contend with the screaming patrons who were spilling out into the street, fleeing from the indiscriminate killing-machine that had planted himself in the center of their not-sleepy Nar Shaddaa street.
The Arconan pulled his comlink from his robe. “Valefar. I’m pinned down in the cantina. Come around onto the street, I’ll toss you a gun.” The HK droid, an ever-vigilant bodyguard, was never far from its Anzat master. But Legorii was now regretting not outfitting him with the blaster in advance. Cautiously, he stepped to the edge of the blown-open building and peered out into the street. There was no sign of Kojiro Keibatsu. Even so, a burst of blaster bolts tore through the gaping hole, forcing Legorii to step back behind what remained of the wall.
Cursing, Legorii recognized his new assailant as an Imperial Sentry Droid. It would prove a worthy challenge for Valefar. Cocking his head, the Anzat listened to the sound of boots thudding up the stairs. That’ll be my guest. He unclipped his lightsaber from his belt and flipped the activation knob. With his free hand, he tossed his rifle out on the open street, hoping that Valefar would find it. And that it wouldn’t be too damaged in the fall.
Kojiro pushed his way into the room, his heavy repeator cannon trained on the Arconan. “I’ll kill you where you stand, Jedi,” he spat. “Shooting at me while my back is turned, then fleeing? You’re a special sort of cowardly.”
Legorii’s crimson eyes narrowed. “No man calls me coward twice,” he replied. He lunged forward, his emerald lightsaber deflecting the first three blaster bolts that erupted from Kojiro’s blaster. The clone immediately started backpedaling. He dropped his blaster to his side and slammed the door to the cantina’s upper room shut. He knew it wouldn’t delay Legorii for long, but it did give the cyborg time to grab his thermal grenade.
Meanwhile, on the street below, Valefar had turned the corner and caught side of the BlasTech rifle that Legorii had tossed him. As he headed toward it, the jet-black Imperial Sentry Droid stationed outside the cantina turned its blaster toward him. The HK droid bent mechanically and retrieved the rifle. Kojiro’s droid opened fire. Exposed, the HK droid immediately took two hits. Neither hit his main circuitry, but as he attempted to return fire, the A280 rifle did nothing. Repeatedly, the droid squeezed the trigger, and the barrel remained curiously silent. Between the rubble above and the fall to the street below, the gun was damaged. Defenseless, Valefar was annihilated by the sentry droid’s relentless stream of blasterfire.
Legorii slashed through the door on the second floor of the cantina. Kojiro had backed sufficiently far down the stairs that he could just barely peek over the top. Gritting his teeth, trying to ignore the pain in his shoulder, he rolled his thermal grenade toward the door and made his way down the steps. The explosive detonated just as the Anzat crossed the threshold. His body was flung back into the room he’d just exited. There, he came to rest, bloody and broken upon the detritus.
A lot of your sentences read a bit choppy - the first four sentences of your post are a good example. There's nothing wrong with that, as it's a stylistic choice. Here, however, the periods/commas are in weird places that break up the flow of the sentence. I think that it reads much better as "Watching, waiting. Oblivious to the startled patrons." I read the sentence aloud and it just sounds strange as written.