While leaving The Colonel’s complex, Caesar discovered that some of The Colonel’s men were gunning down his fellow apes.
Red was instantly shot, but his sacrifice allowed Caesar to blow up the fuel container, which subsequently destroyed the rest of Alpha Omega and its facility.
Grabbing a belt of grenades, Caesar attempted to blow up a nearby fuel container to eliminate those soldiers, but he was by shot by a crossbow before he could do so.
Caesar, his followers and Nova survived by climbing up the nearby trees and avoiding the avalanche’s deadly smothering.