Popokarimu (Mining Area)

Chapter: 2-2 · Train Station and Mines
Where: Mining Area: a circular clearing you drop into from the crate area at the end. A Majini crashes an armoured truck and the Popokarimu climbs out of the wreck. The sheds hold Proximity Bombs (5 or 6), a Hand Grenade, a Flash Grenade, handgun ammo and a Herb (Green).

Weak point

The tail, which is the Plaga: a bullet-deflecting shell with a soft interior underneath that glows red in the sunlight. A strong hit on the tail while it flies drops it. Fandom says it takes double damage from fire and 40% less from shotguns (unsourced).

A Tricell bat implanted with a Plaga: four talons, body slams, flight and a sticky spray from the tail that pins you if you stand behind it too long. You can't hurt it from the front: you have to knock it over to expose the tail and belly.

The classic split: one player kites it in a circle, the other loots the sheds and plants Proximity Bombs in its path. When it steps on one it falls on its side and you both unload into the tail. Don't hide in the sheds: one swipe flattens them.

Reward

Nothing: the Soul Gem belongs to the 4-1 rematch. Once you clear the chapter the shop starts selling Proximity Bombs (from 2-3). Figurine: 10 BSAA Emblems and Chapter 2 cleared.

Solo, you do both jobs (plant and shoot); set AI Sheva to Attack so she fires.

A Rocket Launcher to the head usually kills it in one shot; the S&W M500 takes 5–6 head shots.
The red glow on the weak spot was added late in development because playtesters couldn't find it.

Step by step

Go round the sheds and collect the Proximity Bombs (and the Flash Grenade).
Plant a mine in the middle, in its path, and stay out of the blast. One player lures it, the other waits.
When it falls on its side, switch to the H&K MP5, the S75 or the Dragunov SVD (the shotgun does far less damage to it) and shoot the tail. A stock Dragunov SVD needs about 15–20 hits on the weak spot.
If it flies, a strong hit on the tail brings it down stunned; a Hand Grenade knocks it out of the air too.
If the sticky spray catches you, mash the prompt or have your partner free you. A Flash Grenade stuns it long enough to get away.
Repeat until it screams, climbs and dives: cutscene, and Dave Johnson arrives in the Gambit.