Good little mission !

@Liberty_Valance
you may follow leader's orders to go through waypoints (depend on difficulty setting) one by one, then hostage will joint your group.

Yeah unfortunately that can happen. The AI gets hung up frequently. Ideally, you should head for the truck for a quick evac. If you get stuck, the only thing I've found is to make sure you manually have killed everyone and the leader should give you your next waypoint.

Some units get stuck in the building and don't get out. This causes the mission to fail (since you can't ever finish). That unfortunately is a bug with the game.

If you are the leader, you will have to select your units and chose 1 -> "Next Waypoint" to get them to move on.

and once you killed all the ennemies and located the hostage, then what ?

Nice start. Buggy end. The hostage got killed and then the unit refuses to embark "can not comply" forever.

Very good mission! Thanks