Chapter 4 - part 4 K&L: DM Guide
Last update: 11 May 2016
New objective: Get To The Subway Platform
I guess you might be surprised by the fact that it's going to be the most difficult section of this mission. You will have to leave this area as soon as possible, because SWAT units are heading your way (from all possible directions). Order Lynch to follow your lead. Start running forward. You will have to use the stairs to get to the subway platform. Make sure you're using one of the more powerful assault rifles.
New objective: Wait For The Train
You'll probably have a lot of problems defending yourself against SWAT units. You will have to be hiding near one of the pillars. Order Lynch to do the same thing, however you must face opposite directions. It's very important, because you are going to be attacked by two separate groups. Get ready, because cops will be here in just a few seconds.
Wait for the enemy units to appear near the stairs. Start off by throwing a couple of grenades at them. After that, start using your primary weapon. I would recommend choosing longer bursts, instead of more precise headshots. Prevent SWAT units from getting closer to your position. You could try and stun enemy units with a melee move, however this would be very risky and you would lose too much time.
You will have to deal with your group quickly. Once this is done, turn around and go back to Lynch. He probably won't be able to defend himself without your assistance. Deal with the remaining enemy units. Also, watch out for gas grenades. Throw them back only if you have some free time. Keeping Lynch alive is more important.
You will have to stay here only for a few more seconds. After that, the train will show up at the station (screen). Approach one of the carriages and wait for the game to display a new cut-scene. Get ready for the next mission.