Smoke Bomb. Bug or intentional behavior?

[FAButzke]

So I was trying the new alchemist and, although this is not a new skill, I don't remember it behaving like this before. Basically it says that if an enemy is burning and you throw a smoke bomb on top of him, it should burn for 2 more turns and replicate the burning effect to every other enemy in the area plus the smoke will dissipate instantly. The problem is, it does not work like that. If ALL enemies are already burning and you throw the smoke bomb, it does nothing. You just waste your mana. It should at least make them burn for 2 more turns, but that does not happen. The only scenario where it sort of works is when there are burning enemies mixed with not burning ones and you throw the bomb on top of them. That burns the not burning ones, dissipate the bomb but it DOES NOT add 2 more turns to the already burning enemies.

Normal behavior or bug?

[FAButzke]

For some reason (and I only realised that now) my topic was created three times instead of just once. I deleted the other two. Sorry for the unintenional spam.