Incinerate can't be used with Infernal Flame

Incinerate can't be used with Infernal Flame because you can't spend mana to generate fuel. This simply feels bad and seems like an oversight. I understand Mana Tempest not being usable, but Incinerate and Infernal Flame are both fire-themed and should be usable together.

Dude, Infernalist has way more problems than that.

It's pretty much a 2 point Ascendancy as a caster till level 80 and Hybrid Minions are meh. I've tried the class twice and it doesn't work until you have gear to just one-shot most things anyways.

Probably just one of many oversights with Incinerate. They saw walking simulators and freaked out. Made it a payoff kinda skill without any payoff like most. Even if it was free to cast constantly Fireball + Flame Blast is just so much better. Not even comparable.