(I guess that guy's an NPC now huh?...lol. I think I have an idea of what to do now)
The man on the ground got to his knees fairly quickly, though with a few scratches. He wore a black shinigami uniform, worn regularly, with his zanpakuto sheathed on his left side. It had a black sheath, with a black hilt. The tsuba was a plain rectangle. His uniform was slightly open at the chest, revealing the man as a part of squad two, though only other shinigami would actually recognize the symbol.
"You saw a little of my power didn't you?" Jia proclaimed mockingly "you do realize that now, I can't allow you to live... I assume the man on the ground is your friend, well, let's see how he likes this." Jia grins his Joker smile as he walks slowly to the man and touches his arm.
Suddenly, the man's arm turns a sickly green color, as though it were rotting. He screams in pain. Jia smiles wider, as the man dies slowly, turning into nothing but a pile of rotten flesh. "There we go. Problem one, solved" Jia said, in Japanese so that both of them may understand.

From my rooftop perch I watch as the man on the ground manages to lift himself onto his knees as his uniform feel open, I immediately noticed Squad 2's symbol, I struggle between blowing my cover and helping the man or trying to gather information... or I did until I watched Jia walk over to the man touching his arm. The poor man's arm began turning green as he screamed in pain, I watched in growing anger as the man became a pile of rotted flesh, that had pushed me over the edge and my reiatsu began to spike dangerously as I silently enter shikai, and then followed with entering my not yet perfected shunko.

With a burst of speed and power I was suddenly infront of Jia blades coming in on both sides of his neck, my range causing me to forget the other stranger with him.

My reiatsu continued spiking, the air around me becoming violent ripping at our clothing.

Seething with anger I manage to voice, "WHY!, WHY DID THAT MAN HAVE TO DIE! WHY DID YOU HAVE TO KILL ONE OF MY SQUAD! my voice was full of anger and hatred, I would avenge my comrade no matter what.

The captain finally managed to show himself. Jia was pleased. he would grin more, if he hadn't already been smiling like the Joker already. The man attacks quickly. Shunpo, Jia presumes. He has dealt with shinigami before, but never someone so powerful. "Calm down, man, you might attract attention" Jia parlays. He could feel the cold steel, just caressing the skin of his neck. One even managed to draw blood. Jia was no masochist, but he enjoyed pain. "Stand back, I'll handle this." Jia told his 'partner'.
It was a good thing O Fortuna was already in his hand. Still, even without it, Jia believed he had a chance. "Yes, this is your zanpakuto am I correct? Yes. This must be its sealed state" Jia laughed menacingly "if so, show me your shikai. Come now, all good shinigami have one, don't tell me you don't. Otherwise, I'll just have to kill you." Jia lifted O Fortuna in effort to move the blades away.

Grinning a rage filled smile I retort, " Attract attention?...ha! if you didn't want to attract attention you should have left my squad member alone!" I continue putting pressure on my blades, as one manages to draw some blood as I hear his retort about unleashing my shikai. "Now now, what makes you think I haven't already released my shikai! And who said you'll be able to kill me" I shunpo backwards away from the man before quickly coming in for another attack as I begin gathering reiatsu into my right blade, I swing at Jia with the left trying to cut him hip too shoulder. My reiatsu is continuing to increase the whole time, noticing this I decide to speak up yet again, "Yah know... I don't have the best control over my reiatsu so I might just kill you without meaning to..." The air around me started to glow with a Jade tinge to it, the air now whipping around the both of us all the while adding more and more small lacerations to our bodies...

Perhaps he is not a captain after all. Jia dodges with little effort, leaving a small bit of his jacket cut. This made him angry. "Oh, you managed to cut my jacket... no matter, I'll simply buy a new one" Jia remarked "Still, I can't let you get away with that. You're attacks are sloppy, but in a few seconds, that won't matter." The shinigami also notes his weakness, as Jia has already spotted. His weapon again ignites.
"Latin was never really my thing. I'd much preffer Greek" Jia remarks, with a sigh "still, rules are rules... Demonic Binding: Liga infidelium, Inferos Catenis." With his left hand, he uses his index finger to make a scratch on his thumb, rending blood. A trickle falls to the ground, quickly dissapearing into it. "This'll be fun" Jia says, as black chains rise from the ground beneath his opponent.

Using my zanpakuto's ability to control the wind/air flow I gathered air beneath my feet compressing it. With a burst of shunpo and the air 'exploding' under my feet I barely manage to escape the odd spell of Jia's wondering what kind of Kido that could have been.

Landing a few meters back I point two fingers forward before calling out, "Hado #4 Byakurai! before following up with the Windscar I had managed to charge up in my right blade, 3 blades of wind swiftly followed behind the Hado. Flashing forward with a shunpo I aimed to strike him horinzontaly with both blades wether or not the other attacks failed.

The chains scatter, and dissipate into thin air. "Good, you managed to block my umbra ars, but that's not good enough" Jia smiled, bringing his weapon to his wound, cauterizing it with the open flame. Just as he did so, the shinigami attacked- twice. This could be bad for Jia, but he still had many liberties. Three blades of wind sent forth, as well as a jolt of lightning. This would be difficult to dodge.
Jia first held out his left hand, stopping the wind, opening the recently closed wound. Next would be the shinigami's spell. Jia helf out his weapon quickly, igniting the air he had controlled in front of him, setting it ablaze. As the spell hits the spiral, both the flames, and the lightning bolt dissipate. "Whew! You almost had me there" Jia remarked, "but now, it's time to show you my real power."
Jia lifted the body of his weapon into the air. Invisible gas appears around him, creating somewhat of a mirage in front of him. The weapon appears to melt, and disappear. Flames then start materializing around Jia, in the form of a large spiral. Now, both his arms were free. With his wound already open, Jia tries his spell once more. "Demonic sealing: Liga infidelium, Inferos Catenis!"

Temporarily blinded by the flames I fail to see Jia's guitar vanish as I hear him speak something yet again. As I went to attack yet again I found one of my feet entrapped in the same black chains Jia had summoned before. "Dammit.." I cursed to myself, I swung both my blades at each side of my foot managing too slice the chains, just managing too. I then realized that Jia had stopped my windscar attack... it was odd I hadn't seen it stopped so easy before.

Growing frustrated my reiatsu once again flared beyond my control, the draconic steel(or w/e you wanna call what makes a zan's blade) teeth begin shining a deep jade green color with gold streaks throughout. Wind began picking up around the blades, which slowly tore at my shinigami uniform.. "Yah know... this is my own fault, at this rate I'll have to go bankai just so my reiatsu doesn't kill me... well not right away at least." I said smirking as reiatsu continued to flow into my blades, and out from my body merging with the flowing air around me. I charged forth once again, my eyes and blades glowing jade green, I brought my left blade in to slash horizontally at Jia's ribs, followed with my right which was travelling diagonally aimed to cut from the left should to right ribs. If the attacks succeeded I'd have cut an x-like gash across Jia's torso.

The shinigami launches yet another attack as the first demon maintains his spell, and the other simply stands to watch. You cure are persistent aren't you?" Jia says, as the spiraling flames easily block the shinigami's 'wind scar' attack, leaving small cuts all over Jia's clothing. He sighs, thinking to himself why he couldn't find a stronger opponent- though actually he could, the demon with the signet ring standing behind him. Still, judging by the strong amount of reiatsu being released in the air, this shinigami has yet to unleash his full power, turning Jia's sigh, back into a smug grin.
The shinigami strikes again, this time with his actual blades. Jia has no choice but to let down his flames. The fires disintigrate for a short period of time, but he was not fast enough. The shinigami managed to leave two slashes on Jia's chest. "Good, you've got gall" Jia remarks, lying down. The flame spiral reappears once more, the flames cauterizing the wound, leaving an X-shaped scar, then disappearing once more. Jia then attempts to grab the shinigami's blades.

Seeing my blades cut the man who I now was beginning to believe was a demon I became more confident, even ass flames scarred the strange x I had cut into Jia. Then Jia came forward attempting to grab my blades, while he had managed to grasp my left blade, my right had torn out of his other hand cutting it. Using my left hands index and middle fingers I point at Jia while sending reiatsu to my fingers, before calling out, "Bakudo #61 Rikujokoro!" long golden chains shot forth to entrap Jia, which I followed up with yet another slash of my right blade aiming for his right ribs. If succeeding Jia would be entrapped in the bakudo and suffering a gash to the rib cage.