Kazuya immediately complied. He applied pressure to the sphere of chakra, present at his lower torso; the sphere of chakra was perhaps the essence of life that existed in every Ninja. His body set out almost immediately, as it drained physical energy from the living cells that were present within his body and spiritual energy from the thoughts that resided within Kazuya's mind. The physical and spiritual energy was gathered at the chakra coil, and churned, to perhaps merge it with one another in order to strengthen Chakra. Otherwise, it would not have been possible for Kazuya to properly perform a jutsu.
When it was about time, the chakra was molded and compressed; as Nature Transformation was applied upon it; leisurely altering the properties of the chakra. Kazuya concentrated on power and control, increasing the collisions of the chakra molecules in order to create heat. He was well aware by now, that he had been successful in altering the properties of his chakra and channeled it to the surface of his throat.
Once he had done so, he inhaled air; that is to feed the monstrous flames that lay inside his throat awaiting the day they would be set free. And then? And then, Kazuya exhaled out a large stream of fire that immediately scattered from the east to a west, burning everything that came into it's path that included Dean's clone.
Advantages
1) Perhaps, one the greatest advantage of this technique is the relative ease at which it can be performed. That is, no handseals are required, therefore this technique can be deadly in close - range
2) Another advantage of this jutsu is that the stream of fire scatters over the battlefield. Perhaps, 'scatters' would be a wrong term. Probably, spreads would be a much better term. Now like you mentioned earlier, it can be used to restrict the sight of the opponent however another use could perhaps be to hit targets approaching from multiple sides. This would certainly result in the opponent trying their very best to maintain a distance
Disadvantage
1) Perhaps, the fact that while it restricts the sight of the opponent; it can also do the same to the user. In fact, the user would be completely unaware of what jutsu the opponent is using to counter this.. Whether it is a B rank Suiton or S rank Fuuton until the jutsu reaches too close to the user
2) The fact that this is a B rank jutsu. As obvious as it might seem, in our RP; rarely do people resort to using anything below S and A rank therefore B rank is usually considered as irrelevant when your opponent is spamming S Rank Katon: Gokou Mekkyaku and Fuuton: Tatsumaki Heki
Uses
1) I would probably use this jutsu in conjunction with kunai's attached with explosive tags. As obvious as it might seem, the kunai with explosive tags would be released in a wide range before using this jutsu to set each explosive tag upon fire.