The Evil Blight Spell, while working as intended in function, appears to not cause Combat to engage.
What should happen:
Evil Blight is cast (any of its Curses), Saving Throws are made and Combat kicks off, Enemies become Aggro, Invisibility and the like fade
What actually happens:
Evil Blight is cast and Saving Throws happen. Enemies behave like Skyrim Characters, blaming the wind for Arrows in their Head and Invisibility effects remain intact. For some reason the Curse Effects of Evil Blight do not trigger Combat.