Location: Benediction of Pain
Obtained: Speak with Psycho Krieg
Shoot an oil pipe
Shoot the pipe right next to the Kriegs.
Shoot oil pipe
Climb up the nearby ladder and shoot the pipe at the top.
Shoot oil pipe
Jump off the platform to the left of the Kriegs to find the 3rd pipe.
Find better perspective
Climb up the nearby ladder and jump across the gap to reach a platform above the Kriegs. Look down at the oil.