Moving on;I first begin by building up my chakra within the core of my gut followed by thinking about all the properties of fire and converting my chakra over to katon type. That allows me to then deeply inhale oxygen which infuses with the flame chakra, I'd then exhale thus spewing out a large fireball towards you which explodes into a maelstrom of flames once it nears your position thus converging upon you.
A:
The fact that it begins as a large fireball then as it nears the opponent explodez into a maelstrom that converges on them will catch them off guard.
D:
Whenever it explodes you can't control where or what the flames hit.
( Katon: Gōka Honoo no Hashira Jutsu ) - Fire Release: Great Fire Flame Pillars Technique
Rank: A
Type: Offensive
Range: Short – Mid
Chakra cost: 30
Damage points: 60
Description: The user will knead their fire chakra and release it into the ground by stomping down their leg and then causing three pillars of fire several meters tall spaced out evenly. The Pillars of fire can act as a defensive wall against incoming techniques or targets or used to attack low aerial targets.
Okay, first gather a large amount of katon chakra, then send it to your legs by stomping on the ground, this should release the katon chakra. Doing should create five several meter tall pillars spaced out evenly. The pillars are mainly used for defense.