What's the “farm area” in the final mission?

Question

One of the challenges in the last mission is to kill the HVTs in the farm area within 3 seconds. What's that mean? I thought that it meant to kill the first two people within three seconds of each other, but I'm pretty sure I did that with my sync shot, and it didn't say I did the challenge. Were those the wrong guys, or is that not what it means by three seconds?

Answer 1

It's the middle three people, but you are right on how on how to kill them:

Tactic: Mark the 3 HVTs for your teammates and give the command for a synched shot. All of them will be dead within a second. If you have problems to locate one of the HVTs then throw motion sensors.

Source

Also watch this video on how to do it.