Identify the buyer | Mission 2 - Insurgent Stronghold Splinter Cell: Blacklist Guide

The opening above the building's entrance gate

Spend several moments learning the basics of the Drone's controls. At first, make the drone go up and fly through the small opening located above the main entrance.

Fly ahead and remember to keep close to the ceiling. Stop the drone in the position shown in the above screenshot, i.e. above the room where the meeting is taking place. The attempt to identify the buyer with the drone will fail and, as a result, you will have to determine the buyer's identity o your own.