Chainsaw Majini (Oil Field)

Chapter: 3-2 · Execution Grounds and Oil Field
Where: Oil Field Refinery: 2, one when you ride the zip line to the south-west platform and one when you unbar the gate on the southern centre platform. Control Facility: 1, who arrives by the elevator during the escape with Josh along the iron walkway.

Weak point

Same as in 2-1: the head and hands to stagger him, the legs to make him kneel. A magnum speeds everything up.

The same Chainsaw Majini as in Shanty Town, three of them this time. One chainsaw hit decapitates you and a graze puts you in DYING. The refinery is wide open: here you can snipe them before they close in.

If your weapons are weak, IGN suggests bringing 10–15 Proximity Bombs to this chapter: lure him onto one, hit him while he is down, repeat.

Reward

Refinery: Venom Fang (₦3,000) each, the only 2 in the game. Control Facility: Gold Ring (₦5,000).

Same attacks and same berserk revival as in 2-1 (see Chainsaw Majini (Shanty Town)): he gets up on Veteran, Professional, and on Normal if you haven't died.

He returns in Desperate Escape with red and blue variants (see Desperate Escape bosses).

Step by step

IGN: take the zip line to the platform with the door first; it triggers a checkpoint.
Shoot his head from range with the rifle; when he staggers, melee combo and back off again.
Proximity Bomb in his path: he falls, hit him while he is down, repeat.
Use any barrels or transformers nearby: lead him past and shoot them.
If he gets up berserk with the saw running, shoot him from range; one grenade stops the charge and a second kills him.