Amaterasu: Flame Wrapping Fire

Sasuke manipulates nearby flames of Amaterasu to cover the ribs of Susanoo with the flames, surrounding himself with a cloak, or "shield", of black fire. In addition to the damage it can inflict, this has the psychological effect of causing enemies to hestitate to attack him. Despite this, reckless enemies such as A may decide to ignore the danger to themselves and strike anyway in exchange for taking damage. Also, it has no effect on the user's physical defense besides the already-exisistng bones of Susanoo.