You need to wait again, for the information to be displayed by the game. This time, it concerns the possibility of knocking down the terrorist that is leading Fisher. After you regain control over your character, start chasing the escaping Sadiq, while ignoring the remaining enemies, in the meantime, who will be knocked down also.
After you watch another cutscene, you will have to approach Sadiq and try to overpower him in a melee fight. Because the Engineer Leader is trying to target Fisher with firearm, it is immensely important to dash between the neighboring covers. Perform every dash only when you are sure that Sadiq isn't checking this spot.
Get near the terrorist by moving in the counterclockwise direction and don't hurry about that. Eventually, you need to get to the position shown in the screenshot, i.e. behind Sadiq.
After Fisher and Sadiq start to struggle, use the right analog stick (or the mouse), to target Sadiq's left arm, and shoot. Note - if you don't target the pistol in time, Sadiq will liberate himself and the fight will extend unnecessarily. What is even more, in such a situation , Sadiq may start using frag grenades to eliminate Fisher faster so, it is best to complete this event at first take.
Go towards the evacuation point marked by the game and keep in mind that Sadiq will attack Fisher once again. There are only three QTE events for you to play - you first need to grab Sadiq (a single pressing of the melee key/button), then to prevent Sadiq from stabbing Fisher (rhythmical tapping of the melee key/button) and to spare Sadiq (a single pressing of the melee key/button).
The correct performance of the entire sequence, will result in the playing of the outro. Congratulations - you have just completed the game's campaign mode! Note - you don't need to worry if you haven't completed the previous side missions because, after you return to the mobile command center, you will be able to play them (as well as all of the already completed missions to, e.g. acquire the missing collectibles or improve on your statistics).