Thank you for the video! Yea after you talk to the legionnaires, you do'nt really have any choice but to do what Sidorovich asked you, kill them all. It probably made you feel bad but that's my purpose haha. After you kill everyone at the barn house, you can do the puzzle for turning on the water sprinkler for the potato field, and then report back to Sidorovich who will give you a bonus.