Ustanak (warehouse)

Chapter: J1 · Edonia: the sewers, the warehouse and the helicopters
Where: 1-2 Water Channel: the big warehouse, ringed by an upper walkway

Weak point

The head; the metal arm takes less damage

Jake's pursuer. First you flee (hold sprint: jog and it catches you), then the warehouse fight. Explore before opening the green doors: that starts the fight. There are 6 explosive barrels on the ground and 5 on the upper walkway: shoot one just before it passes (once it's past, its body blocks your shot). It usually follows you upstairs, so the walkway is the ideal loop.

Reward

Medal Escaped from a collapsing building.

Jake's hand-to-hand combos stagger it on every hit and interrupt its attacks. Flash Grenades do nothing to it. Health from a single unconfirmed source: 8,000, 6,000 and 10,000 across three encounters that can't be mapped with confidence.

Step by step

Before the green doors: go up the central stairs, jump the gaps and kick down the 2 ladders (your escape routes). Take the Elephant Killer from the 2nd-floor storage room (through the hole in the wall); each player gets their own. Switch back to the handgun to save magnum ammo.
Open the green doors together: the Ustanak drops in.
Loop: central stairs → jumps → perimeter → the ladders you kicked down. Shoot barrels as it passes them. If your partner provokes it downstairs, it stays down there: agree on a plan.
Remote Bombs on the upper walkway: about 4 is enough on Normal (single source).
Dash ram: from medium or long range with line of sight; it slams you into a wall and almost certainly puts you in Dying. Sidestep.
Claw grapple: the arm device opens first (that's the tell). Up close, move to its side or duck; a long-range version drags you in. If it catches you, rotate the stick, or your partner hits the Ustanak to free you.
The J'avo sliding down ropes give ammo: melee them only when the Ustanak isn't winding up a charge.
It ends crushed under rubble (cutscene).