TIL Ifrit's Infernal Howl is Line of Sight

[Gamemako]

Wicked Wheel is the AoE, not Slipstream. Slipstream is a Cone attack.

AoE = Area of Effect, meaning any ability which targets an area rather than a single target. You can have a straight line or column AoE, PBAoE (point-blank AoE, in a circle around the caster), cone AoE, etc.

On topic, certainly not an exploit, though they may still change it as they did with most other such spells. Might be an oversight.