Fighting with magic fingers., Opponents dice pool Options

[Edward]

Fighting with magic fingers.
Opponents dice pool

The spell clearly determines the dice pool the caster uses when he attacks with magic fingers. His own unarmed skill the spells agility (net sorcery hits) with a 2 dice penalty for unusual positioning and presumably any visual penalty that may applyand probably -2 for sustaining the spell.

What dice pool dose the victim use to resist this. I would assume it would be unarmed combat but what penalty for the absence of an actual opponent, not only can you not see to predict an angle of attack but you cant wave your weapon around hoping to keep your opponent at bay.

Edward