Vision (Classic) is doing zero damage with his specials.
In Arena I was fighting a 4-star WWII Captain America with a 4-star Vision (Classic). Both Special 1 and Special 2 were doing no damage to him, even though they were power draining him (and he had power stored). He did not block any of the hits, and was taking damage from regular punches, but Specials had no effect. I did not try to use Special 3, as I didn't have time in the fight to get that bar of power.