As Kelvin saw his attack had been leveled out with a wind technique, he noticed Niklaus reaching for his fan, he immediately knew a wind technique was coming at his, so he decided to hit him with a high rank fire technique. Making one handseal, he exhales quite a large amount of fire which levels out the wind and continues as A rank at him.
While scratching his head with the "little naruto laugh", he said "Why so serious?
(Katon: Gōka Mekkyaku) - Fire release: Great Fire Majestic
Annihilation
Rank: S
Type: Offensive
Range: Short - Long
Chakra cost: 40
Damage points: 80
Description: A technique where the user makes the horse hand
seal and then kneads chakra inside his body which is then
converted into fire and expelled from the mouth as a massive
wall of intense flames, which covers an expansive range in both
vertical and horizontal dimensions, making it extremely difficult
to avoid. However, due to its massive width and height, the
technique is not one of the fastest seen so far.