After rescuing the first fifteen firemen listed above in the first part of this side-mission, you’ll get your objectives updated, telling you to head to a location in northern Founders’ Island. This location is actually on a rooftop where you will find the Chief tied up similarly to the other firemen we have rescued. The difference here is that there are 16 Armed Thugs and a Predator setup to contend with, rather than the brawling that the previous objectives encouraged.
To rescue the chief, we’ll need to secure the area, which requires us to knock out all of the bad guys. This rooftop zone is quite large and features a good number of underfloor vents, hatches to transition between levels, cables, breakable floors and generators.
After clearing the rooftop and rescuing the chief, drive back to GCPD to end the Most Wanted mission.