Jack (Nightmare)

Chapter: BF1 · Banned Footage Vol. 1 · Nightmare, Bedroom and Ethan Must Die
Where: Nightmare (Banned Footage Vol. 1): the Processing Area under the Main House

Weak point

The head

In Nightmare you play as Clancy and survive 5 rounds, from midnight to 5 a.m., against waves of Molded. Jack shows up in round 2 (as in the Main House) and round 5 (with the Morgue's chainsaw-shears), and you have to beat him. You buy weapons, ammo and traps with Scrap at the workbench.

Reward

Bonus Scrap for beating him. "Dead by Dawn?" (complete Nightmare) and "Sleepless in Dulvey" (complete Night Terror) achievements.

In Night Terror every enemy has more health and attacks more often, and Jack arrives with stronger escorts.

Step by step

Save the traps (turrets, tripwires) for the end of each round and for Jack.
The handgun is your main weapon and the shotgun your second; use the Grenade Launcher only on groups of 3 or more, strong Molded or Jack.
Bottleneck the corridors and go for headshots only.