Although Delsin wants to just trash the DUP guards, Reggie suggests that they try to sneak through the Scanning Station. Follow him to the checkpoint and wait your turn, then move to the scanner when you can. Go to the scanner and push the Touch Pad, then slide your finger in one motion to the designated point. Of course, the scanner recognizes you’re a Conduit and now you’ll be forced to fight the DUP security.
At the moment, you only have the Smoke Shot, Smoke Dash, and Cinder Blast as your primary abilities, as well as your melee capabilities. The DUP will basically use their guns, but some of them can launch grenades at you, so it’s wise to keep moving. If you need to refill your smoke meter, you can shoot a vehicle a few times and drain the smoke.
You should see some towers, which you can destroy easily with a few or a well- placed Cinder Blast. Keep going, watching out for the sniper at the second set of towers, and Reggie will chime in and tell you about the Mobile Command. These are basically vehicles that the DUP use to monitor the various districts. They are located in restricted areas where the DUP will attack pretty much on sight.
There will be a lot of resistance in the area and your goal is to destroy the vents on the Mobile Command to expose the power core. Before you do that, take out all of the DUP in the area, so you won’t be interrupted. When it’s clear, shoot the vents until you see the power core appear. Jump on top of the Mobile Command and do the motion on the touchpad (hold it), then press R2 repeatedly to destroy it.
With the Mobile Command down, the DUP will send a heavily armored guy after you now, who is armed with a minigun. What you want to do is keep shooting him from a distance, using cover if needed, or by using the rooftops, allowing you access to refill your power meter. Once you’ve dealt enough damage, the big guy will retreat into a barrier, which is your cue to sneak up behind him and press the shown button to take him out. Go over to his body and try to drain him to no avail, ending the mission.