The targets in "A house Built on Sand" can be eliminated using different methods and in different situations, or using similar ones. The latter has been described on this page.
- Assassinate Matthieu Mendola and Kong Tuo-Kwang during the meeting (Opportunity: Waiting for the man)
- Snipe your targets down
Assassinate Matthieu Mendola and Kong Tuo-Kwang during the meeting (Opportunity: Waiting for the man)
This method assumes leading to the meeting between Mendola and Kwang, and assassinating them in a single attack. You have to prepare yourself here. Still before you start the mission, take along lethal poison (only if you are going to poison your targets). Also, it could be useful to take wrench (M10,1) (only if you are going to sabotage the oil lamp).
The next thing to do is obtain bodyguard disguise and, for the Opportunity connected with that, find the sick bodyguard in the alley, in the North-Western corner of the map (M10,19). You can easily attack him by surprise and hide the body. The only difficulty is leave the alley while already disguised as bodyguard. The other guard may blow your cover and this is why, use the coins that you have found around, to distract him.
Find Matthieu Mendola and talk to him while disguised as bodyguard, thanks to which he will follow you to the meeting point (Kong Tuo-Kwang will also be soon notified of that - you do not have to meet him). Reach the entrance of the building next to the café (M10,17). After you enter, you will unlock the abovementioned Opportunity. Still, you have to prepare the scene for the assassination.
Right after you get Mendola into the building, you should hurry to the rooftop (M10,12) to plan the entire assassination. One of the methods assumes that you sabotage the gas lamp on the rooftop. Since it is within the seeing distance of one of the bodyguards, use any throwable to distract him and sabotage the lamp before Mendola arrives. The gas in the lamp should be leaking for long enough for it to explode only when the meeting takes place.
An even better variant is to use the poison on the shisha pipe here. Also in this case, make sure that the bodyguard on the rooftop walks away, thanks to which he won't spot you in the act. Try using lethal poison. Mendola and Kwang, after the transaction, will take their places at the shisha pipe and die after a while. It is a good idea to leave the spot quickly, because their deaths will alarm bodyguards on the rooftop (even though, formally, it will count as a lethal accident).
Snipe your targets down
In Marrakesh, you will find no sniper rifle and for that reason, you have to select your own rifle for delivery into the area. It is necessary that you pick the silenced one. Also, it would help if the rifle could zoom in on targets, although this is not necessary. You should begin the mission by obtaining bodyguard disguise, which will make it easier to reach possible vantage points. For this, you can attack the sick bodyguard in the alley (M10,19).
The stash with the sniper rifle is on the rooftop in the Western part of the map (M10,15) and the easiest route there is up the pipe shown in the above screenshot, at the back of the building (M10,7).
After you collect the rifle, reach the rooftop, where the meeting is scheduled to take place. Take your position in spot shown in screenshot 1 (M10,13), from where you can see the VIP area in the café. Wait for Kong Tuo-Kwang to head towards the room with the shisha pipe (screenshot 2) (M10,7) and take him down. RIGHT AFTER you take the shot, dash down the stairs and leave the building, because it is highly possible that bodyguards will check the spot after the assassination.
An ideal vantage point is on the rooftop of one of the buildings neighboring the carpet shop (the above screenshot) (M10,16). You can get there in two different ways. Variant one assumes that you reach the Agency stash and climb up the wall of the neighboring building. The other variant is that you reach the entrance of the carpet shop (M10,8) and open the door to the rooftop.
Regardless of your variant, wait for Matthieu Mendola to appear near the neon light in the Southern part of the café (M10,1). Take a shit and hide behind the wall right afterwards, to prevent being spotted.