As the mission starts, approach Dwight's body and read his memories. Follow the bulbous shape down the street. You'll soon meet an artist hanging posters.
Continue following the electrical signature of what is a Dust Men Conduit. Around the corner you'll run into the Conduit's scorpion spawn. They're easy enough to take care of; just use Lightning Bolts or melee attacks. The Dust Men that come behind, on the other hand, are a different matter. Spray them with grenades. Around the next corner is a machine gun turret. Take this opportunity to get up to the roof and throw Grenades down on the turret.
Continue after the Conduit ghost (use 
if you've lost it). As you go down the street, keep an eye on the mini-map for red dots. A wave of kamikazes backed by an RPG is coming. After you cross the canal, you'll be hit by more kamikazes. You'll then thread through some alleys – recharge at the nearest source – in the street beyond the Conduit with his RPG and more scorpion spawn is waiting for you.
Ignore the scorpions and use Shockwave to deflect the grenades while peppering the Conduit with Lightning Bolts. Throw in a grenade or two to finish him off (and take out the scorpions). The important thing is not to let the grenades hit you – other than that, this guy's a piece of cake. Afterwards, return to Zeke's "apartment" to continue the story.