Haha dumb it down maybe u should learn to explain stuff better anway sasuke only used shield of black flame to protect him self from A. Why would he cover himself In amaterasu while fightin zetsu they are no challenge amaterasu doesnt cosume alot of chakra, susanoo didok lets try to dumb this down ...... where do u see amaterasu in saskue sasunoo?You must be registered for see links
u can see amaterasu in its hand only ..... his sasunoo its self doesnt have amaterasu protecting it .... he has to summon it just like he did with the raikage fight.... 95 % of the sasunoo battle with saskue he uses his amaterasu as an attack not a defence because it consumes alot of chakara