Sav
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Apparently, the Archdevil's spell was cast just as its turn ended, and casting Blind doesn't immediately cause it to skip its turn. This should generally be considered a bug, as is, for example, the fact that a Phoenix resurrects after some time has passed since it was sacrificed.
I also noticed another small detail while looking into the Blind spell: casting Hypnotize on a creature removes its Berserk status, and casting Berserk on a creature removes its Hypnotize status. In particular, since Berserk can be cast on your own units, you can use it to cure them of Hypnotize.
And regarding poison – it is completely cured by healing (the spell itself is removed, and the entire health penalty is removed), but it is not removed by dispelling spells (neither the spell itself nor the health penalty is removed, although if the spell is active, you can attempt to dispel it, but it will be ineffective).
I also noticed another small detail while looking into the Blind spell: casting Hypnotize on a creature removes its Berserk status, and casting Berserk on a creature removes its Hypnotize status. In particular, since Berserk can be cast on your own units, you can use it to cure them of Hypnotize.
And regarding poison – it is completely cured by healing (the spell itself is removed, and the entire health penalty is removed), but it is not removed by dispelling spells (neither the spell itself nor the health penalty is removed, although if the spell is active, you can attempt to dispel it, but it will be ineffective).