Help with a spell

Melcar

Mongoose
I was in the library last night, in the restricted section, and I read something rather odd about a rare piece of magic. It’s called as I understand it:
Arcing Death I came across the spell while reading and I didn't fully understand it.

Arcing Death
Evocation [Electricity]
Level: Sor/Wiz 5
Components: V, S, M
Casting Time: 1 action
Range: Close (25 ft.+ 5 ft./2 levels)
Targets: 1 target
Duration: Instantaneous
Saving Throw: Fortitude half (see text)
Spell Resistance: Yes
One of the more unpleasant spells in the lightning specialist’s arsenal, this potent attack spell surrounds a target with several coruscating bands of electricity that deal 1d8 points of damage per caster level to the target, with a Fortitude save for half damage. In addition, the target is knocked unconscious for 1 round per caster level if the Fortitude save is failed, and is stunned for 1d6 rounds even if the Fortitude save is successful.
Material Component: A copper wire shaped into a ring.

Now, as I see it, only something immune to electricity will not be effected by the stun. Can someone elaborate on this please?
 
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