None of the materials in question had worked, so it was clear this particular type of demon wasn't vulnerable to a specific material. His next choice would be to move through a series of religious artifacts, pagan symbols, and other such weapons. If these failed, he had multiple other methods of containment in mind. However, it was clear that Abbadon was the more powerful foe. In speed, strength, and sheer explosive power Abbadon was more capable. The only reason Shiro was able to hold his own was his immense skill and proficiency with his power, allowing him to project the Absolute Eye and use his Arsenal to his advantage. His opponent was uninventive in his application of power, however, preferring simple brute force and attacks.
Eventually, Abbadon seemed to be able to guess where Shiro would move instants before he moved there. He had lost the element of surprise in his attacks. This attested to his opponent's capability to adapt their strategy, a dangerous trait. However, if he could get in close, and use his blade... if he was able to sever the limbs, and then introduce a material that kept them seperated, he might be able to prevent the demon from reforming. Regeneration could be prevented through the permanent introduction of matter. It was a risk, but it was a risk worth taking.
It was a mistake, of course. Even as Shiro appeared, blade in hand, he knew it had been a mistake. His opponent was already facing him, even as the tendrils shot towards his face. Within moments, he would have been killed. And yet, a bright white light seemed to explode from some point in between the two combatants.
"You're smarter than the average demon"
A newcomer. A wild card had been thrown into the fight. This timely intervention had saved Shiro, as well as giving him a chance to collect his thoughts. The demon had backed off, questioning the woman. Not as aggressive as he had originally believed, but it was clearly still just an animal. "Intelligent or not, it remains a demon. It has already tasted human blood, and undoubtedly will take more. We must contain it before it spreads chaos to the rest of the city." From the powers Shiro had observed so far, and from what he knew of the heroes that generally operated in this city, it was clear that this demon was a level above what the locals could handle. Even if it was eventually defeated, there would be many casualties. His success here was imperative.
In the distance, sirens could be heard. With a slight grunt, Shiro projected the Absolute Eye to the other side of the city. Seeing through a portal far above the commotion, he had the perfect point of view to see the army of fish-men invade the city. Heavily armed, they ripped through the law enforcement. Superhuman in speed and strength, if not in technology. A large and devastating force that even now was fighting to claim the central infrastructure.
"You, try and contain the demon. I will support you from a distance. However, there is another matter I must address." With those words, Shiro disappeared, reappearing on a skyscraper above the carnage. It seemed like it was time to use a more powerful technique. A power that many had thought to be seperate from his teleportation, and yet was secretly merely the advanced application of it. Shiro stretched out his right hand, the palm thrust out towards the forces far below. He would decimate their numbers from here.
A wave of wind and force washed over the forces. An explosion of air moving at almost supersonic speed, ripping apart flesh, bone and even stone. Like a tank shell made of wind, it crushed anything in it's way. Shcokwaves with lethal force, each one in a different location, the source of the attack unknown. A large quantity of air, drained away from the atmosphere, and then suddenly reintroduced to it in a single point. The supercrompressed material rapidly expanded in a deadly explosion. Burst, the final offensive hidden technique developed by Shiro.
Although it rapidly drained him, this move would with equal speed decimate the forces below.