The basic thing that you should get before this battle is the armor and amulets protecting from lightning. Shima is armed with a long spear and lands several standard, but deadly, blows. Usually, these are jabs and swings, The battle consists of two phases that take place alternately. After a while, Shima summons his guardian spirit and his weapon deals damage from lightning, at which point you have to keep clear. The battle itself is about dodging from the opponent's blows and returning with your own attack. Also, it is a good idea to exhaust the enemy and deal the finishing blows when his chi drops to a minimum.