There are numerous places to execute the roaming and stationary Extremists in the area. Head over to the West from the starting point and you will a patrolling pair of Extremists as well as a stationary one nearby a Chimney. Keep on the rooftops and you will see a variety of chances. Watch for the patrols. If you can perform a Double Assassination, it is a great way to get through most of the requirement quickly. Just watch them being below you otherwise. You need to complete these kills before you make it into the Hideout.
- 3 Air Assassinations
- 2 Phantom Blade Kills