Digital Domain’s previs team, led by Jason Donnelly, played a pivotal role in crafting the film's climax, where the two actors had a final showdown against the alien invaders in the mountains. By using their real-world shoot locations, the team could choreograph the layout and map out the action beats so the director and onset production knew exactly what they would see. The Digital Domain previs team also supplied several options for composing shots and actions beforehand in tandem with look-developing the creatures’ heavy FX-driven deaths.

There was an added challenge due to the ongoing SAG-AFTRA strike. However, by combining existing footage with additional previs, the team was able to create a compelling climax and significantly increase the tension.