Following the Clues in Highland Park

Chapter 6 - Moving Shadows Decrypted data contained in a dead man's neural hub pointed Jensen to an abandoned factory complex in Highland Park. Flown there by Faridah Malik, Jensen sets out to investigate the area. Little does he suspect what he will find...

M10 - Following the Clues in Highland Park is a mission in Deus Ex: Human Revolution.

Infilitrate the mercenary compound
Enter the compound. Jensen can do this by entering the warehouse by:
 * Hacking a computer and entering via a roof door.
 * Enter through the ground floor door
 * Jump over some boxes at the back
 * In the yard is a fence which provides an easy access to the building
 * In the building near the elevator is an ammo capacity upgrade

Once inside the warehouse take the elevator at the bottom of the ramp to complete this objective.

Locate the mercenary leader
On the second floor entrance to the 'Interrogation Area' (there are wall maps in game), there is a security hub controlling a door and a camera in the back room. In here are a shotgun, 5 shotgun cartridges, 1 typhoon ammo, 1 rocket and a concussion grenade.

Just before the Medical Bay is a camera and a small computer room beside it. In this room is a reload speed mod behind a cardboard box. At the end of the F.E.M.A camp is Barrett.

Defeat Barrett
Kill Barrett by any means. Barrett's primary armament is a machine gun which can overheat. His secondary armament is throwing a cluster of grenades. If he gets in melee range, most of the time he will kill Jensen outright. Ammunition is scattered around and there is also a locker full of shotguns. A cheap way to kill him is to throw the barrels at him until he dies.

Meet Malik at our original landing site
Take the quick exit door ahead.

Barrett Tactics

 * Barrett is the first boss encounter in Human Revolution.
 * He attacks primarily with his minigun-arm, and also throws frag grenades. He will melee the player if he gets too close.
 * Barrett is vulnerable to headshots as well as EMP, concussion, gas, and frag grenades.
 * Supplies are located throughout the edges of the room and there are several pillars and boxes for cover.
 * Setting traps using UR-DED or proximity mines works well.
 * Various item in the room: boxes, fire extinguishers, gas canisters, and explosive barrels can be thrown at Barrett and many will stun him. This is a good method for sneaky players who are not outfitted with heavy weapons.
 * Barrett can be stun-locked with the stun gun and enough ammo (~25 darts on Give me a Challenge).
 * If the player hides long enough Barrett will eventually kill himself with his own grenades.
 * Best place to hide is behind the box in supply room - Barret will not enter there even if you are spotted
 * If you are hacker/sneaky type, hide-and-shoot tactic also works, however not very fast.
 * Using the rocket launcher can end this fight fast. Two hits with the rocket launcher and a few shots from the pistol or machine gun are sufficient.
 * Using the Typhoon Explosive System is effective but risky. At close range, Barrett will melee.
 * The game can be saved during the encounter.
 * A relatively easy method is to hide behind a pillar and stun him as he approaches the corner, switch to a magnum and hit him for 4-5 headshots, reload and repeat. A gas grenade or thrown gas bottle for distraction and about 5-7 headshots with the magnum also do the trick.