So.. The truck was headed away from the farm, and ran into the gendarmes (I assume that is when the firefight occured? Else why would the gendarmes -still- be there). Then Ferhaz came into town. Picked up Rubiera and his son and the supplies, and drove back -toward- the farm. Stopped at the site of the earlier ambush (since the truck was found there). Somehow Rubiera and his son were brought to the farm and killed, we happened upon the scene..
No. That makes no sense.
Ok, Rubiera and family were killed earlier in the day. Afterwards, Ferhaz drove into town for some reason, ambushed the gendarmes on the way, went to town for some reason, then drove back to the site of the ambush, left the truck there, and made his way to the farm on foot (not that far, we did it too). We came upon the site of the ambush, we know what happened then...
We need access to that prisoner, nothing makes sense to me.