Just look at your what it does. "Damage" does not exist in a Jutsu, that's what power is for. I suggest that you read up on the Jutsu rules as the would be power is ridiculously underpowered compared to others. Also, don't forget that since its a taijutsu it can include stat boost. I'll give you a hand here, the maximum cap numberwise would be 50 for b rank, so you would be able to have a +50 stat boost to speed and the flames can have 50 power