Instructions
Run back from the four bandits and Mr. Black and keep strafing from side to side to avoid their fire. Return fire at first by focusing on the four bandits. Once you have killed each of the four bandits, you can focus on Mr. Black.
Run to one of the stone walls at the edge of the cemetery and press the "L3" button on the controller to crouch behind it. Do not attempt to take cover behind the gravestones as Mr. Black's fire will break through them.
Fire on Mr. Black repeatedly from behind the wall and periodically crouch down to avoid his fire. If your health is low, run out from behind the wall and collect the health power up which was left after you killed the four bandits. Once you have replenished the health, return behind the wall and continue firing on Mr. Black until he is defeated.