I've blinded many an enemy and they still somehow seem to cast targeting spells. Perfect example just happand. My raven blinded a Death Shepard but he/she/it still somehow targeted a corpse to re-animate it.
Sorry if this is under the "wrong forum", I'm not sure where else it should go.
Maybe in this particular instance it's an "undead thing" and undead can't be blinded? Not sure bout that but there's been plenty of other enemies that certainly CAN be blinded, and I blind them, and they still target things. It's not a "wild swing in front of them". It's a targeting spell.