Go to the top of the barn (located next to the house where you found the shotgun in the main game). There is also a timer under the ladder, and a chest above, and up the ladder. Go up there and wait for the Los Illuminados to come to you. When they are mostly packed in, shoot the barrel inside and jump down quickly. Get what they dropped. Get back up the ladder and repeat. Do not throw a grenade while there is a flame barrel down there; it will not do twice the damage. Also, be careful of the Chainsaw Hags that appear. They will cut off your head if you get too close. It is best if you are Hunk or Krauser to use the neck break; and the transformation of Krauser's arm, which kills them in one hit. With Ada or Wesker, use their sniper rifles until they are both gone, then jump down, With Leon try grenades, but it is very difficult.