Leave Garza's side and move down onto the street area in the next stage where you'll get involved in a fire fight. Take a look at the top of the left side of the building across the way and you should be able to view a Helghan symbol. Find the doorway to the building. Enter it and then use the stairway to move upstairs. Look around and you'll find a Helghan symbol through a half open door of one of the rooms. Use your objective marker to move about the building. It gets a bit hard at times, and it will really help. Eventually, you'll drop through to the lower area through a handy hole in the floor, where you'll reach the next checkpoint. Look around and you will see an Intel case just sitting on the floor for you to grab.
Once you reach the Malik Back Alleys, you'll encounter a doorway that has live current running through it for protection purposes. Find the wires leading to the power source and it will lead you to the fuse box with a blue light. Take the box out to remove the current. You should also by now easily spot the Helghan symbol on the wall to the left of the fuse box. You can also find another Helghan symbol if you can a look on the wall on the other side of the barbed wire bridge before ascending down the ladder.
You will meet up with Alpha squad after this part, and right afterwards Red-eyes will attack. Go into the mini-bunker and stay there. Once Rico has trouble with the door lock, another group will arrive via airship. The enemy will once again try the door, and then when unsuccessful will attack from everywhere. Make note of the M224-A1 LMG hanging in the gun rack by the stairs and the way this area would make a perfect flanking point. Once the tank shows up at the scene and releases the final wave things start to move. At this point Garza arrives and the door finally opens.
Garza and Natko will be busy arguing in the kitchen in this next part, so take the opportunity to move over to them and find an Intel package on the ground beside them. Alpha squad will then land in the Square outside and join you in the battle. Once you clear the enemy out of this area head over to the machine gun and take your position. Mow down the Higs as they exit the building, take aim here and try to kill three Helghans with one blast of your machine gun, and you'll earn the "Run and Gunner" PS3 Trophy. At this point re-enforcements will arrive by tank, air and on foot, and your machine gun can't take out a vehicle in this battle.
After you get the area clear, another wave will attack from the direction of the cable car. Once you eliminate them, two Heavies show up attacking from the front side. Taking care of the first with your machine gun shouldn't be a problem, but the other Heavy may move out of range once he realizes the situation and you may have to take him out the normal way. Now that you have completed this section, be sure to check out the rest of this Killzone 2 guide series.