It really depends how much damage Tempest does. Tempest is not an instant kill effect and more of a DoT when you hold the trigger. It's more of a Bladedancer like super than FoH. But with the spec that makes enemies in the field slower, it's like a FoH that attacks only the frontal cone that still gives enemies the chance to wipe you out, there is no super damage reduction. FoH would be better in Panic Button situations and where enemies are spread out but still in the radius of your super. Arc Blade is good for chaining multiple kills together from far apart. Tempest is almost a mix of the too, once activated you move like a Bladedancer but deal splash/area damage in your frontal vision over time. I could change the Annihilation Field perk, I created it so players wouldn't just walk out of the lightning effect easily. I guess it could make the move more Target-Tracking.